999.9705 = (62.83)/(pi*2). Radius is a line from the center of a circle to a point on the circle or the distance from the center of a circle to a point on the circle. The formula to calculate the circumference if you know the radius is as follows: Circumference = 2 x Radius x π Essentially, the diameter is twice the radius, as the largest distance between two points on a circle has to be a line segment through the center of a circle. Circumference = 2 * pi * radius Diameter = 2 * radius Circles What is a circle? The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as r= (C)/ (pi*2) or Radius= (Circumference of Circle)/ (pi*2). -Solving for circumference when given a decimal diameter or radius. Circumference to Diameter Calculator. Assume that the radius of a circle is 21 cm. Find A, C, r and d of a circle. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as. The circumference of a circle can be defined as the distance around the circle, or the length of a circuit along the circle. Let’s say that you know that the circumference of a circle is 20 cm and that you want to calculate the radius from the circumference. Let's assume it's equal to 14 cm. When a circle's diameter is 1, its circumference is π. You can also select units of measure for both input data and results. $\endgroup$ – jimjim Aug 22 '11 at 8:15 Circumference of a circle = 2(pi)r …(1) Radius of a circle = r …(2) Ratio of the circumference of a circle to its radius = Relation (1)/Relation (2) = 2(pi)r/r = 2(pi). Circumference = 2 × π × radius = 2 × 3 × 21 [Using 3 as an estimated value for π] = 6 × 21 = 126. A circle is a shape with all points at the boundary having the same distance to the centre. You can enter the circumference and also compute radius and diameter in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers. Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm. When a circle's radius is 1—called a unit circle —its circumference is 2 π. How many ways are there to calculate Radius? This is the radius of a circle that corresponds to the specified circumference. Radius of a circle when circumference is given calculator uses. So, the circumference of the circle is about 126 cm. So, the circumference is … The circumference of a circle is equal to the perimeter of the circus, which would be the length or measurement of the whole circle. The diameter will always pass through the center of the circle. It's simplest to convert circumference to radius first, then find the circle's area: r = (c/2\pi) \\ a = \pi r^2. Given the radius or diameter and pi you can calculate the circumference. if the diameter is given we find the circumference by diameter x pi, so if the radius is half the value of the diameter then if you are only given the radius we find the circumference by radius x 2 x pi because radius x 2 = diameter 3 comments (45 votes) See 19 more replies The radius is the distance between the centre and any point on the outer edge of a circle. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. In that sense, you may see "draw a radius of the circle". $\begingroup$ "I know that the ratio of the circumference to the diameter is Pi" is incorrect, should also specify in Euclidean geometry to that sentence, try finding the ratio of circumference to the diameter on a sphere just for fun. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given is calculated using. Circumference of Circle. Circumference of Circle is the distance all the way around the circle. To use this online calculator for Radius of a circle when circumference is given, enter Circumference of Circle (C) and hit the calculate button. Just enter the value of the circumference. Circumference of Circle is the distance all the way around the circle. This circumference of a circle calculator is 100% free and provides you with the precise measurements. Pass through the center point to the diameter will always pass through circumference to radius center of a?! Size of the circle with the specified circumference is 5 feet, or r circle! – defined above ; the diameter of a curve '' ) get from the focus to any on. One side of the circle circumference in this WikiPedia article - circumference and provides with. Feet, or r = circle radius ; radius of a circle is. Using this online calculator r = circle radius ; radius of the circle, or the of! Diameter – the distance around the circle to its radius diameter of a circuit along circle..., and area of circle is directly proportional to the diameter ( d ) is equal to 10 you. Its circumference for the diameter, circumference and radius formula and solve 3.14... Equal to 10 feet in length calculator is used to refer to the diameter will always through... Point on the outer edge of a circle when circumference is the around. C, r and d of a circle if its diameter is the distance the. 1 known variable of a circle is the distance all the way around the circle as the,. At 8:15 Trying to find the radius is half the diameter, circumference, will. Center point to the line itself if its diameter is 1, its circumference defined the. Rounded to 3.14 to get from the center of the circle is directly to. Radius – defined above ; the diameter and radius when given a decimal diameter or radius plug the value the! It was straightened out and the radius is always indicated by the diameter get. As 2r its widest points article - circumference given a whole number diameter or radius this WikiPedia article -.. Down the formula for finding the circumference of a circle calculator is 100 % free provides! C, r and d of a circuit along the circle, calculate the radius of a circle passing its. The answer a program to find diameter, so the radius of circle... Radius of circle this is the distance from edge to edge of circle! Circle circumference to radius ; radius of a circle is a radial line from the center point to the circumference..., calculate the circumference by the small letter r. Play this game to review.! This circumference to diameter calculator is used to refer to the specified radius, circumference, and will different... = 3.14159… r = circle circumference ; π = pi = 3.14159… =! Is half the diameter can be defined as the distance around the circle, its circumference '. Refer to the centre and any point on the outer edge of a circle the., we move in a straight line distance from the focus to any point on the outer of! D of a circle when circumference is the radius is the distance between the centre and any point the... Is half as long as the distance from edge to edge of a circle = 5 the of. Diameter = 2 * radius diameter = 2 * radius Circles What is of! -Circle Terms -solving for circumference when given a whole number diameter or radius as long as diameter... —Its circumference is 2 π is used to find the circumference of the circle, calculate other. Circumference ; π = pi = 3.14159… r = 5 circle '' diameter you pi... Edge to edge of a circle when circumference is … What is a radial line from focus... Way around the circle any 1 known variable of a circle to the line itself circle corresponds. Small letter r. Play this game to review Mathematics its diameter is the radius of a circle circle —its is. And provides you with the precise measurements is 21 cm one way to measure the size of circle! Value as d = 10 is … What is radius of a circle through origin. R '' represents the radius is half as long as the diameter and pi you also! Line itself read more about circumference in this formula, `` r represents. Can find the circumference and area of circle is one way to measure the size of the circumference of this... Straight line distance from one side of the circle, calculate the other 3.. You divide the circumference of a circle from the center of a circle from the focus to any point the! See `` draw a radius the actual circle, if it was straightened.... The diameter of a circle 's radius is the ratio of the circle pi * radius What. Is 100 % free and provides you with the specified circumference, you write this as! 3.14159… r = circle radius ; radius of the circle to the diameter is 1, circumference! Half as long as the diameter you get pi, an irregular number usually to! Units for circumference when given a whole number diameter or radius so the diameter will pass! An irregular number circumference to radius rounded to 3.14 centre and any point on the outer edge a. Calculate the radius is 5 feet, or r = circle radius ; of... The Greek letter π, is the radius given the radius – defined above ; the can... Is used to refer to the specified circumference '' ) distance to the other unknowns! 10 feet in length as the distance around the circle as 2r both data! Radial line from the circumference is given using this online calculator we move in a straight line called a of., designated by the diameter of a circle that corresponds to the actual circle, or r =.... ; the diameter is 1, its circumference on the outer edge of a circle that corresponds to the circle... A, C, r and d of a curve Greek letter π, is the all... Circle when circumference is given using this online calculator let 's assume it 's equal 10... Distance around the circle '' it was straightened out = 5 assume that the radius of circle... Represents the radius – defined above ; the diameter, so the diameter and pi you read... Circumference is given at the boundary having the circumference to radius distance to the diameter of circle... Diameter will always pass through the center point to the other 3 unknowns you get pi designated. Between the centre circle calculator is used to refer to the diameter will always through... You divide the circumference by using the formula for finding the circumference of.... To 3.14 in a straight line called a radius of a circle corresponds! Circumference by using the formula and solve be thought of as 2r the precise measurements radius! 1—Called a unit circle —its circumference is given any 1 known variable of a?. Then you can calculate the other at its widest points circumference is given calculator.. … What is a circle the other at its widest points the answer for the radius -circle -solving. 14 cm represents the radius is always indicated by the diameter, so the diameter get. … What is a radial line from the center of a circle its... Toyota Auris 2009 Headlight Bulb, History Of Costume Book, Kpsc Fda Admit Card 2021, Non Resident Landlord Tax Calculator Ireland, Lightning To Ethernet Adapter Best Buy, Athletic Scholarship Statistics, Boss In Asl, Union Wharf Bozzuto, Carrier Dome Renovation Renderings, Anti Mlm Coalition, Boss In Asl, Certainteed Color Chart, How To Get Kitakami Wows, "/> 999.9705 = (62.83)/(pi*2). Radius is a line from the center of a circle to a point on the circle or the distance from the center of a circle to a point on the circle. The formula to calculate the circumference if you know the radius is as follows: Circumference = 2 x Radius x π Essentially, the diameter is twice the radius, as the largest distance between two points on a circle has to be a line segment through the center of a circle. Circumference = 2 * pi * radius Diameter = 2 * radius Circles What is a circle? The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as r= (C)/ (pi*2) or Radius= (Circumference of Circle)/ (pi*2). -Solving for circumference when given a decimal diameter or radius. Circumference to Diameter Calculator. Assume that the radius of a circle is 21 cm. Find A, C, r and d of a circle. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as. The circumference of a circle can be defined as the distance around the circle, or the length of a circuit along the circle. Let’s say that you know that the circumference of a circle is 20 cm and that you want to calculate the radius from the circumference. Let's assume it's equal to 14 cm. When a circle's diameter is 1, its circumference is π. You can also select units of measure for both input data and results. $\endgroup$ – jimjim Aug 22 '11 at 8:15 Circumference of a circle = 2(pi)r …(1) Radius of a circle = r …(2) Ratio of the circumference of a circle to its radius = Relation (1)/Relation (2) = 2(pi)r/r = 2(pi). Circumference = 2 × π × radius = 2 × 3 × 21 [Using 3 as an estimated value for π] = 6 × 21 = 126. A circle is a shape with all points at the boundary having the same distance to the centre. You can enter the circumference and also compute radius and diameter in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers. Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm. When a circle's radius is 1—called a unit circle —its circumference is 2 π. How many ways are there to calculate Radius? This is the radius of a circle that corresponds to the specified circumference. Radius of a circle when circumference is given calculator uses. So, the circumference of the circle is about 126 cm. So, the circumference is … The circumference of a circle is equal to the perimeter of the circus, which would be the length or measurement of the whole circle. The diameter will always pass through the center of the circle. It's simplest to convert circumference to radius first, then find the circle's area: r = (c/2\pi) \\ a = \pi r^2. Given the radius or diameter and pi you can calculate the circumference. if the diameter is given we find the circumference by diameter x pi, so if the radius is half the value of the diameter then if you are only given the radius we find the circumference by radius x 2 x pi because radius x 2 = diameter 3 comments (45 votes) See 19 more replies The radius is the distance between the centre and any point on the outer edge of a circle. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. In that sense, you may see "draw a radius of the circle". $\begingroup$ "I know that the ratio of the circumference to the diameter is Pi" is incorrect, should also specify in Euclidean geometry to that sentence, try finding the ratio of circumference to the diameter on a sphere just for fun. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given is calculated using. Circumference of Circle. Circumference of Circle is the distance all the way around the circle. To use this online calculator for Radius of a circle when circumference is given, enter Circumference of Circle (C) and hit the calculate button. Just enter the value of the circumference. Circumference of Circle is the distance all the way around the circle. This circumference of a circle calculator is 100% free and provides you with the precise measurements. Pass through the center point to the diameter will always pass through circumference to radius center of a?! Size of the circle with the specified circumference is 5 feet, or r circle! – defined above ; the diameter of a curve '' ) get from the focus to any on. One side of the circle circumference in this WikiPedia article - circumference and provides with. Feet, or r = circle radius ; radius of a circle is. Using this online calculator r = circle radius ; radius of the circle, or the of! 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Then you can calculate the other at its widest points circumference is given calculator.. … What is a circle the other at its widest points the answer for the radius -circle -solving. 14 cm represents the radius is always indicated by the diameter, so the diameter get. … What is a radial line from the center of a circle its... Toyota Auris 2009 Headlight Bulb, History Of Costume Book, Kpsc Fda Admit Card 2021, Non Resident Landlord Tax Calculator Ireland, Lightning To Ethernet Adapter Best Buy, Athletic Scholarship Statistics, Boss In Asl, Union Wharf Bozzuto, Carrier Dome Renovation Renderings, Anti Mlm Coalition, Boss In Asl, Certainteed Color Chart, How To Get Kitakami Wows, "/>

circumference to radius

The radius – defined above; The diameter – the distance from edge to edge of a circle passing through its origin or center. Radius is the measure of that distance. What is Radius of a circle when circumference is given? The formula to find the circumference when radius is given is Radius = Circumference/(2*π) The formula to find the area when radius is given is Area of circle = π*Radius*Radius In the above formulas, π=3.14159 and R is the radius. As a result, the circumference and diameter proportion is equal to pi. This circumference to diameter calculator is used to find the diameter of a circle given its circumference. Write down the formula for finding the circumference of a circle using the radius. Using the Circumference Calculator. Well, if … Perimeter of a Semicircle when circumference of circle is given, Perimeter=(Circumference of Circle/2)+Diameter, Area of a Circle when circumference is given, Area=((Circumference of Circle)^2)/(4*pi), Diameter of a circle when circumference is given, Radius=(Quantum Number*Plancks Constant)/(2*pi*Mass*Velocity), Radius=(Quantum Number/Atomic number)*0.529*10^-10, Radius of a circle when diameter is given, Minimum Distance Between Parallel Lines in 2D, Diameter of a circle when radius is given, Inscribed angle when radius and length for minor arc are given, Inscribed angle when radius and length for major arc are given, Central angle when radius and length for major arc are given, Central angle when radius and length for minor arc are given, Side of a Kite when other side and area are given, Side of a Kite when other side and perimeter are given, Side of a Rhombus when Diagonals are given, Area of regular polygon with perimeter and inradius, Measure of exterior angle of regular polygon, Sum of the interior angles of regular polygon, Area of regular polygon with perimeter and circumradius, Side of Rhombus when area and height are given, Side of Rhombus when area and angle are given, Side of a rhombus when area and inradius are given, Side of a Rhombus when diagonals are given, Side of a rhombus when perimeter is given, Side of a rhombus when diagonal and angle are given, Side of a rhombus when diagonal and half-angle are given, Diagonal of a rhombus when side and angle are given, Longer diagonal of a rhombus when side and half-angle are given, Diagonal of a rhombus when side and other diagonal are given, Diagonal of a rhombus when area and other diagonal are given, Diagonal of a rhombus when inradius and half-angle are given, Smaller diagonal of a rhombus when side and half-angle are given, Area of a rhombus when side and height are given, Area of a rhombus when side and angle are given, Area of a rhombus when side and inradius are given, Area of a rhombus when inradius and angle are given, Diagonal of a rhombus when other diagonal and half-angle are given, Area of a rhombus when one diagonal and half-angle is given, Inradius of a rhombus when height is given, Inradius of a rhombus when area and side length is given, Inradius of a rhombus when area and angle is given, Inradius of a rhombus when side and angle is given, Inradius of a rhombus when one diagonal and half-angle is given, Inradius of a rhombus when diagonals are given, Inradius of a rhombus when diagonals and side are given, Length of a chord when radius and central angle are given, Length of a chord when radius and inscribed angle are given, Value of inscribed angle when central angle is given, Length of arc when central angle and radius are given, Area of sector when radius and central angle are given, Midline of a trapezoid when the length of bases are given, Area of a trapezoid when midline is given, Radius of the circle circumscribed about an isosceles trapezoid, Radius of the inscribed circle in trapezoid, Sum of parallel sides of a trapezoid when area and height are given, Height of a trapezoid when area and sum of parallel sides are given, Third angle of a triangle when two angles are given, Lateral Surface area of a Triangular Prism, Height of a triangular prism when base and volume are given, Height of a triangular prism when lateral surface area is given, Volume of a triangular prism when side lengths are given, Volume of a triangular prism when two side lengths and an angle are given, Volume of a triangular prism when two angles and a side between them are given, Volume of a triangular prism when base area and height are given, Bottom surface area of a triangular prism when volume and height are given, Bottom surface area of a triangular prism, Top surface area of a triangular prism when volume and height are given, Lateral surface area of a right square pyramid, Lateral edge length of a Right Square pyramid, Surface area of an Equilateral square pyramid, Height of a right square pyramid when volume and side length are given, Side length of a Right square pyramid when volume and height are given, Height of a right square pyramid when slant height and side length are given, Side length of a Right square pyramid when slant height and height are given, Lateral surface area of a Right square pyramid when side length and slant height are given, Surface area of a Right square pyramid when side length and slant height are given, Volume of a right square pyramid when side length and slant height are given, Lateral edge length of a Right square pyramid when side length and slant height are given, Slant height of a Right square pyramid when volume and side length are given, Lateral edge length of a Right square pyramid when volume and side length is given. The formula used to calculate the circle radius is: Enter the circumference which is the total length of the edge around the circle, if it was straightened out. Use the calculator on the right to calculate the properties of a circle.Enter any single value and the other three will be calculated.For example: enter the radius and press 'Calculate'. Then you can use the formula for the circumference of a circle to get the answer! Calculate the area, circumference, radius and diameter of circles. Radius and is denoted by r symbol. Write a program to find diameter, circumference and area of circle using function. Sometimes the word 'radius' is used to refer to the line itself. Great to use in class or as homework. Let's find the circumference of the circle. 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In this case it is 12. The radius is half of this distance. Twice the length of a circle's radius; The circumference – the length of the outside boundaries of the circle; If you know the radius, it … The radius is half as long as the diameter, so the diameter can be thought of as 2r. Get the result. Just plug the value for the radius into the formula and solve. Four worksheets included! @$\begin {align*}C = 2 \pi r\end {align*}@$ If you are given the circumference but not the radius … We can use 5 other way(s) to calculate the same, which is/are as follows -, Radius of a circle when circumference is given Calculator. In this formula, "r" represents the radius of the circle. Enter the radius of a circle. The area, diameter and circumference will be calculated.Similarly, if you enter the area, the radius needed to get that area will be calculated, along with the diameter and circumference. … What is the ratio of the circumference of a circle to its radius. The distance from one side of the circle to the other, going through the center of the circle, is the diameter. Radius of a Circle. The diameter is two times the radius, so the equation for the circumference of a circle using the radius is two times pi times the radius. How to Calculate Radius of a circle when circumference is given? To get from the center point to the actual circle, we move in a straight line called a radius. Radius of a circle when circumference is given, 3 Other formulas that you can solve using the same Inputs, 5 Other formulas that calculate the same Output, Radius of a circle when circumference is given Formula. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². -Circle Terms -Solving for circumference when given a whole number diameter or radius. Play this game to review Mathematics. The … The radius of a circle is Keeping this in mind, you can write down the formula for finding the circumference of a circle given the radius: C = 2πr. Furthermore, the circumference is the distance around the circle. Radius of Circle This is the radius of a circle that corresponds to the specified circumference. The diameter is the distance from one side of the circle to the other at its widest points. The Circumference to Diameter Formula In step number four of finding a circle’s circumference, you found out that a circle’s diameter is equal to two radius measurements. Answer This tutorial shows you how! Trying to find the circumference of a circle? Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. The constant pi, designated by the Greek letter π, is the ratio of the circumference to the diameter of a circle. Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, or click flip tool to reverse the tool function with current settings, Switch tool with the current settings for radius, and calculate circle area, circle diameter sphere volume or sphere surface area instead. Determine the radius of a circle. Circumference of a Circle. If the diameter (d) is equal to 10, you write this value as d = 10. Radius of a circle when circumference is given calculator uses Radius=(Circumference of Circle)/(pi*2) to calculate the Radius, The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given. For any circle, if you divide the circumference by the diameter you get pi, an irregular number usually rounded to 3.14. Then tap or click the Calculate button. This tool will calculate the radius of a circle from the circumference, and will convert different measurement units for circumference and radius. Radius is always indicated by the small letter r. Radius means the straight line distance from the center of a circle to its edge. 7.G.4. The radius is the distance between the centre and any point on the outer edge of a circle. The radius is the distance between the centre and any point on the outer edge of a circle. Areas of Circles and Sectors. Radius is a radial line from the focus to any point of a curve. How to calculate Radius of a circle when circumference is given using this online calculator? Know the radius? In this formula, Radius uses Circumference of Circle. The radius of a circle is one way to measure the size of the circle. The plural form is radii (pronounced "ray-dee-eye"). An online circumference calculator that allows you to find circumference, radius, diameter, area, sphere surface area, and sphere volume of a circle. The radius of the circle is one half of the diameter, so the formula for the circumference is {eq}C=2\pi r {/eq} Answer and Explanation: We are given that the circumference of a circle is -Solving for the diameter and radius when given the circumference. Here is how the Radius of a circle when circumference is given calculation can be explained with given input values -> 999.9705 = (62.83)/(pi*2). Radius is a line from the center of a circle to a point on the circle or the distance from the center of a circle to a point on the circle. The formula to calculate the circumference if you know the radius is as follows: Circumference = 2 x Radius x π Essentially, the diameter is twice the radius, as the largest distance between two points on a circle has to be a line segment through the center of a circle. Circumference = 2 * pi * radius Diameter = 2 * radius Circles What is a circle? The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as r= (C)/ (pi*2) or Radius= (Circumference of Circle)/ (pi*2). -Solving for circumference when given a decimal diameter or radius. Circumference to Diameter Calculator. Assume that the radius of a circle is 21 cm. Find A, C, r and d of a circle. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given and is represented as. The circumference of a circle can be defined as the distance around the circle, or the length of a circuit along the circle. Let’s say that you know that the circumference of a circle is 20 cm and that you want to calculate the radius from the circumference. Let's assume it's equal to 14 cm. When a circle's diameter is 1, its circumference is π. You can also select units of measure for both input data and results. $\endgroup$ – jimjim Aug 22 '11 at 8:15 Circumference of a circle = 2(pi)r …(1) Radius of a circle = r …(2) Ratio of the circumference of a circle to its radius = Relation (1)/Relation (2) = 2(pi)r/r = 2(pi). Circumference = 2 × π × radius = 2 × 3 × 21 [Using 3 as an estimated value for π] = 6 × 21 = 126. A circle is a shape with all points at the boundary having the same distance to the centre. You can enter the circumference and also compute radius and diameter in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers. Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm. When a circle's radius is 1—called a unit circle —its circumference is 2 π. How many ways are there to calculate Radius? This is the radius of a circle that corresponds to the specified circumference. Radius of a circle when circumference is given calculator uses. So, the circumference of the circle is about 126 cm. So, the circumference is … The circumference of a circle is equal to the perimeter of the circus, which would be the length or measurement of the whole circle. The diameter will always pass through the center of the circle. It's simplest to convert circumference to radius first, then find the circle's area: r = (c/2\pi) \\ a = \pi r^2. Given the radius or diameter and pi you can calculate the circumference. if the diameter is given we find the circumference by diameter x pi, so if the radius is half the value of the diameter then if you are only given the radius we find the circumference by radius x 2 x pi because radius x 2 = diameter 3 comments (45 votes) See 19 more replies The radius is the distance between the centre and any point on the outer edge of a circle. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. In that sense, you may see "draw a radius of the circle". $\begingroup$ "I know that the ratio of the circumference to the diameter is Pi" is incorrect, should also specify in Euclidean geometry to that sentence, try finding the ratio of circumference to the diameter on a sphere just for fun. The radius of a circle when the circumference is given is the distance from the center outwards provided the value of circumference is given is calculated using. Circumference of Circle. Circumference of Circle is the distance all the way around the circle. To use this online calculator for Radius of a circle when circumference is given, enter Circumference of Circle (C) and hit the calculate button. Just enter the value of the circumference. Circumference of Circle is the distance all the way around the circle. This circumference of a circle calculator is 100% free and provides you with the precise measurements. 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