alex3049 alex3049

20-09-2018
Business

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∆DEF, FE=5 and angle D=43

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20cookelilyana 20cookelilyana

20-09-2018

The side FE is opposite to the angle <D in the right triangle ∆DEF while DE is the adjacent side.

Thus, FE / DE = tan<D and DE = FE cot<D = 5 / tan 43° = 5/0.93 = 5.4 and the answer is B.

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