If a || b || c and m∠9 = 76°, find the measure of each missing angle.

Answer:
m∠1 = m∠3 = m∠5 = m∠7 = m∠9 = m∠11 = 76°
m∠2 = m∠4 = m∠6 = m∠8 = m∠10 = m∠12 = 104°
Step-by-step explanation:
Vertical angles are congruent. When lines are parallel, corresponding angles are congruent.
m∠1 = m∠3 = m∠5 = m∠7 = m∠9 = m∠11 = 76°
m∠2 = m∠4 = m∠6 = m∠8 = m∠10 = m∠12 = 180 - 76° = 104°