Find m∠1 if m∠2=73°, m∠3=107°, m∠4=92°. Justify your response!

Answer:
92°
Step-by-step explanation:
The supplementary relationship between angles 2 and 3 means lines a and b are parallel. Since those lines are parallel, corresponding angles 1 and 4 are congruent.
m∠1 = m∠4 = 92°