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a) tan 28 = 50/a => a = 50/ tan 28 = 94.04m

b) Height of plane from lighthouse keeper = 85-50 = 35m

tan @ =35 / 94.04 = 0.3722

=> @ = angle of elevation of airplane from top of lighthouse = 20.42

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I got 20.42 too but the answer says 24.0😐

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Hmm… that’s weird.  Well, someone else try, please.

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