1. 4.7 Isosceles and Equilateral Triangles Legs: the 2 ≅ sides of an isosceles Ve rtex Angle: the < formed by the legs Ba se: the 3rd side Ba se Angles: the 2 < s adjacent to the base Base Angles Theorem: If 2 sides of a are ≅ , then the < opposite them are ≅ . Co nverse of Base Angles: If 2 <s are ≅ , then the sides opposite them are ≅ . vertex < leg leg base base < base <

2. Corollaries: I f a triangle is equilateral, then it is equiangular. If a triangle is equiangular, then it is equilateral. Find ST in the triangle at the right. STU is equilateral, then its is equiangular.

5. Find the values of x and y in the diagram. x ° = 60 ° y ° = 120 °

6. HW pg. 267 #3-27 odd