Spell. The angles opposite the congruent sides are called the base angles. Last updated at Sept. 3, 2019 by Teachoo. Equilateral triangles have 3 equal sides and 3 equal angles of 60° Spell. Share practice link. Solo Practice. Print; Share; Edit; Delete; Host a game. The vertex angle of an isosceles triangle measures 40°. 5. Edit. 1. Euclid defined an isosceles triangle as a triangle with exactly two equal sides, but modern treatments prefer to define isosceles triangles as having at least two equal sides. Lesson 2: Triangle Congruence by SSS and SAS | Geo… 4 terms. Terms in this set (5) M

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