Question

if ∠1 is 70°, then ∠8 is how many degrees?

Explanation:

Step1: Identify angle - relationship

$\angle1$ and $\angle8$ are alternate - exterior angles. When two parallel lines are cut by a transversal, alternate - exterior angles are congruent.

Step2: Determine the measure of $\angle8$

Since $\angle1 = 70^{\circ}$ and $\angle1\cong\angle8$, then $\angle8=70^{\circ}$.

Answer:

C. 70