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Chapter 4: Congruent Triangles Lesson 6: Isosceles Triangles Isosceles Triangles . Vertex Angle leg - If two sides of a triangle are congruent, the two angles opposite of them are also congruent leg -If two angles of a triangle are congruent, then two sides opposite of them are also congruent Base angles - If a triangle is equilateral, it is also equiangular A. Find mR. B. Find PR A. Find mT. ALGEBRA Find the value of each variable