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tomson1975

Greetings from Brasil...

Here we have supplementary angles, that is, the sum of both results in 180. Therefore,

A + B = 180 ⇔ ∠1 + ∠2 = 180

∠1 + ∠2 = 180     by defining supplementary angles

143 + ∠2 = 180

∠2 = 180 - 143

∠2 = 37°

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