Answer:
see below
Step-by-step explanation:
a) ∠1 = 180 - 123 = 57°
b) ∠3 = 100° (congruent to ∠18)
c) ∠4 = 180 - 100 = 80°
d) ∠5 = 123° (opposite to ∠2)
e) ∠6 = 57° (opposite to ∠1)
f) ∠7 = 38° (alternate angle to ∠12)
g) ∠8 = 180 - ∠7 - ∠9 = 180 - 38 - 100 = 42°
h) ∠9 = 100° (congruent to ∠18)
i) ∠10 = 57° (congruent to ∠1)
j) ∠11 = 180 - ∠10 - ∠12 = 180 - 57 - 38 = 85°
k) ∠13 = 100° (parallel angle to ∠3)
l) ∠14 = 80° (parallel angle to ∠4)
m) ∠15 = 123° (parallel angle to ∠5)
n) ∠16 = 57° (parallel angle to ∠6)
o) ∠17 = 80° (opposite angle to ∠14)
