Question

Two parallel lines are crossed by a transversal.

Horizontal and parallel lines g and f are cut by transversal h. At the intersection of lines g and h, the bottom left angle is a degrees. At the intersection of lines f and h, the bottom left angle is 63 degrees.
What is the value of a?

a = 43
a = 63
a = 117
a = 137

Answer 1

a = 63

Reason: When two parallel lines are cut by a transversal, corresponding angles are equal. The two bottom-left angles are corresponding, so a = 63°.