# The vertex angle of an isosceles triangle is 9 degrees more than a base angle what is the vertex angle?

Answers: 2

## Answers

The vertex angle of an isosceles triangle is 9 degrees more than a base angle what is the vertex ang...

base angles 57°

Step-by-step explanation:

let the equal angle of the isosceles triangle be x

the vertex angle is 2x + 20

sum of all angles of triangle is 180

x + x + 2x + 20 = 180

4x + 20 = 180

4x = 180 - 20

4x = 160

x = 160/4

x = 40°

the equal angle are 40° and 40°

the vertex angle = 2x + 20 = 2(40) + 20 = 80 + 20 = 100°

the three angles are

40°, 40°, 100°

hope you get your answer