Question

Use the exterior angle theorem to find the value of x in the triangle below.

A
x = 7

B
x = 5

C
x = 12

D
x = 15

Answer 1

A) x = 7

Explanation:

7x + 1 + 7x + 6 + (180 - 15x) = 180

combine like terms:

-x + 187 = 180

subtract 187 form both side of the equation:

-x = -7

x = 7