0031544 0031544

26-03-2021
Mathematics

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Аноним Аноним

26-03-2021

Answer:

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 °

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