Question

the measure of ∠1 is 120° in degrees, what is the measure of ∠7? m∠7 = degrees

Explanation:

Step1: Identify angle - pair relationship

Assume the two lines are parallel and the vertical - line is a transversal. $\angle1$ and $\angle7$ are corresponding angles.

Step2: Apply the property of corresponding angles

If two parallel lines are cut by a transversal, corresponding angles are congruent. So $m\angle7=m\angle1$.

Answer:

120