Question

A pair of parallel lines is cut by a transversal:
What is the measure of angle x?

Answer 1

40 degrees

Explanation:

The alternate interior angles are equal when parallel lines are cut by transversal.

Basically the angle 70 would be equal to the 2 angles (x and 30). Thus we can say:

70 = 30 + x

x = 70 -30

x = 40

Hence x is 40 degrees