Question

Lines a and b are parallel.

What is the value of x?

A. 5

B. 10

C. 35

D. 55​

Answer 1

(A) 5

Explanation:

Because of triangle sum, the vertical angle of the one whose label is 11x, is "90 - 7x," and because of Vertical Angle Theorem, 90 - 7x = 11x.

90 - 7x = 11x -->

90 = 18x -->

5 = x