1. Analyzing Isosceles Triangles Chapter 4, Section 6

2. Isosceles Triangles Theorem 4-6: Isosceles Triangle Theorem- If 2 sides of a triangle are congruent, then the angles opposite those sides are congruent.

3. Example 1 In isosceles triangle with base.If, and, find the measure of each angle of the triangle. S I F2x+40 3x+22

4. Some Important Notes: Theorem 4-10: If 2 angles of a triangle are congruent, then the 2 opposite sides are congruent. Corollary 4-3: If you have an equilateral triangle, then you have an isosceles triangle.

5. Example 2 Find the value of all of the variables: 2z-1 5y+10 7y+2 17 o