Triangles 1
Name __________________
Worksheet
Date _______ Period _____
Isosceles Triangles Worksheet #1
Complete. Draw pictures to help solve.
1. The vertex angle of an isosceles triangle is 40 . What is the measure of one base
angle?
2. One base angle of an isosceles triangle is 73 . What is the measure of the vertex
angle?
3. The degree measure of the vertex angle is (7x - 27) . The degree measure for
each base angle is (9x - 34) . What is the value of one base angle?
4. The ratio of the measure of a base angle in an isosceles triangle to the measure of
the vertex angle is 2:16. Find the measure of each angle.
5. The degree measure of the vertex angle is (3x - 8) . The degree measure for each
base angle is (6x - 41) . What is the value of vertex angle?
6. The degree measure of the vertex angle is (x + 21) . The degree measure for each
base angle is (2x + 17) . What is the value of x?
7. The vertex angle of an isosceles triangle is 76 . What is the measure of one base
angle?
8. The ratio of the measure of a base angle in an isosceles triangle to the measure of
the vertex angle is 1:7. Find the measure of each angle.
9.
The measure of the vertex angel of an isosceles triangle is twice the measure of a
base angle. Find the measure of a base angle.
10. The measure of the vertex angle of an isosceles triangle is 20 less than twice the
measure of a base angle. Find the measure of the vertex angle.
11.
Isosceles Triangles Worksheet #1 - ANSWERS
11. 70
12. 34
13. 65
14. each base is 18 and the vertex is 144
15. 46
16. 25
17. 52
18. each base is 20 and the vertex is 140