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Find the missing side. Round to the nearest tenth. 3) 13 72° хtrigonometry

Find the missing side. Round to the nearest tenth. 3) 13 72° хtrigonometry-example-1

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By definition,

cos(angle) = adjacent/hypotenuse

From the picture,

cos(72°) = x/13

cos(72°)*13 = x

4 = x

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