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Learn about isosceles triangle legs and vertex angles, the Isosceles Triangle Theorem, equilateral triangles, and more with Module 15: Lesson 2. Homework includes problems 1-20 on pages 745-750.
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An isosceles triangle is a triangle with at least 2 sides congruent or the same length. An equilateral triangle is a triangle all 3 sides congruent or the same length. Module 15: Lesson 2Isosceles & Equilateral Triangles
Legs: The sides that are congruent in length. Vertex Angle Vertex Angle: Angle formed by the legs. Leg Leg Base: The side opposite the vertex angle. Base Angles: The angles opposite the legs. Base Base Angles
The Isosceles Triangle Theorem When the legs are congruent then the base angles are congruent. A Statement C B ΔCAB ΔBAC
The Converse of the Isosceles Triangle Theorem When the base angles are congruent then the legs are congruent. A C B
Equilateral Triangle: All 3 sides are the same length. Equiangular Triangle: All 3 interior angles are the same measure. The Equilateral Triangle Theorem All equilateral triangles are equiangular. The Converse of the Equilateral Triangle Theorem All equiangular triangles are equilateral.
