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Answers on questions: Chemistry
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Ответ:
Ответ:
∠A = ∠C, so ∠C = 87°.
ABCD is a quadrilateral, so all of its interior angles must add up to 360°. We know 3 of the 4 angles, so we'll add them up and subtract the answer from 360.
∠A + ∠C + ∠D ⇒ 87 + 87 + 115 = 289
360 - 289 = 71
m∠B = 71°