jesusdelao
12.10.2020 •
Mathematics
Can someone help me please
Solved
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Ответ:
∠A = 58°
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
∠ACD is an exterior angle
∠A and ∠B are the opposite interior angles, thus
∠A + 80 = 138 ( subtract 80 from both sides )
∠A = 58°