Need help with this one

Dzintars asked Jan 6, 2022

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10 votes

Dzintars asked Jan 6, 2022

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20 votes

Answer:

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 °

Manuel Eberl answered Jan 12, 2022

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