Question

In the diagram l1 is parallel to l2A 45. B 135. C 170. D 180

Answer 1

Let me draw the diagram here below:

Given that the measure of angle 3 is 45°, we want to find the measure of angle 7.

Notice that both angles are vertical angles. For this reason, their measures are equal. Then, the measure of angle 7 is 45° too.