# Geometry - Congruent Triangles - Chapter 4

 The congruent sides of an isosceles triangle are called ______________. legs The non congruent side of an isosceles triangle is called the _______________. base The two angles at the base of an isosceles triangle are called the _________________. sides If two angles at the base of an isosceles triangle  congruent, then _______________________. the angles opposite them are congruent. If two angles of a triangle are congruent, then ________________________________. the sides opposite them are congruent. If a triangle is equilateral, then it is __________. equilangular If a triangle is equiangular, then it is ____________ . equilateral Theorem 4-1 The Isosceles Triangle Theorem If two sides of a triangle are congruent, then the angles opposite those sides are congruent. The Isosceles Triangle Theorem (Theorem 4-1) often stated that the base angles of an isosceles triangle are congruent. *  An equilateral triangle is also equiangular. *  An equilateral triangle has three 60° angles. *  The bisector of the vertex angles of an isosceles triangle is perpendicular to the base at its midpoint. Theorem 4-2 If two angles of a triangle are congruent, then the sides opposite those angles are congruent. Corollary  An equiangular triangle is also equilateral. SSS - side, side, side ASA SAS AAS HL Find interior and exterior angle sum Find each interior and exterior angle in regular polygons Find missing interior and exterior angles in irregular polygons Differentiate between convex and non-convex polygons CPCTC AuthorMamadams ID290886 Card SetGeometry - Congruent Triangles - Chapter 4 DescriptionGeometry Updated2014-12-07T16:13:20Z Show Answers