Question

if m∠6 = 72°, then m∠8 =?
a. 72°
b. 80°
c. 100°
d. 108°

Explanation:

Step1: Identify angle - relationship

$\angle6$ and $\angle8$ are vertical angles.

Step2: Apply vertical - angle property

Vertical angles are congruent. So if $m\angle6 = 72^{\circ}$, then $m\angle8=m\angle6$.

Answer:

A. $72^{\circ}$