21shuldrak
27.03.2021 •
Mathematics
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Answers on questions: Mathematics
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Ответ:
Step-by-step explanation:
B + 87 +78 +66 = 360
B = 129 °
the angle next to B then is
180 = 129 + b '
51 ° = b '
A + 61 + b ' = 180
A = 68 °
Ответ:
The correct answer is third option