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Name
4-5
Class
Date
Practice
Form G
Isosceles Triangles
Complete each statement. Explain why it is true.
1. BED 
Algebra Find the values of x and y.
2.
3.
4.
5.
Use the properties of isosceles triangles to find the measure of the indicated angle.
6. mACB
7. mDBC
8. mABC
Prentice Hall Gold Geometry • Teaching Resources
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
43
Name
4-5
Class
Date
Practice (continued)
Isosceles and Equilateral Triangles
Use the diagram for Exercises 15–17 to complete
each congruence statement. Explain why it is true.
9. DF 
10. DG 
11. The wall at the front entrance to the Rock and Roll Hall of Fame and Museum
in Cleveland, Ohio, is an isosceles triangle. The triangle has a vertex angle of
102. What is the measure of the base angles?
12. Reasoning An exterior angle of an isosceles triangle has the measure 130.
Find two possible sets of measures for the angles of the triangle.
Algebra Find the values of m and n.
13.
14.
Prentice Hall Gold Geometry • Teaching Resources
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
44
Form G
15.
16.