Answer:
m∠1 = 130°
Step-by-step explanation:
Same-Side Exterior Angles Theorem: "States that when parallel lines are cut by a transversal line, the same-side exterior angles are supplementary"
According to the Same-Side Exterior Angles Theorem, ∠7 and ∠1 are supplementary angles.
This means that the sum of their angles will equal 180°. Therefore, you can find the measurement of ∠1 by subtracting the measurement of ∠7 from 180.
Given: m∠7 = 50°
180 - 50 = 130°; ∠1 = 130°
