Question

in the figure, find the measure of angle ACD

Answer 1

aloha user!!
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∠ ACD = 66° + 45°
∠ ACD = 111°

another method:

∠A +∠B + ∠ACB = 180°   ( sum of angles of triangle is 180° )
∠ACB = 180 - 111
∠ACB = 69°

∠ACB + ∠ ACD = 180   ( straight angle )
69 + ∠ ACD = 180
∠ ACD  = 180 - 69
∠ ACD  = 111°

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hope it helps :^)

Answer 2

In triangle ABC,

A+B+C=180

66+45+C=180

111+C=180

C=180-111

C=65 ans....