Geometry Section 4.6 Isosceles Triangle Theorem. Goals for today: 1. Identify the parts of an isosceles triangle. 2. Learn and apply the Isosceles Triangle Theorem and its converse.
Recall that an isosceles is a triangle with _________________.The congruent sides are called the ____ and the noncongruent side is calledthe_____. The angle formed by the two legs is called the ___________ while the two angles at each end of the base are called ___________.
two congruent sides
Theorem 4.6 Isosceles Triangle Theorem (ITT)If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
Theorem 4.7Converse of the Isosceles Triangle Theorem (ITTC)If two angles of a triangle are congruent, then the sides opposite those angles are congruent.