in order to land safely, a helicopter needs to know how high it is from a helipad, how far horizontally it is from the helipad, how far is it to fly (diagonally), as well as the angle of depression. A helicopter wants to land on a hospital helipad that is 2 miles away (horizontally), and wants to start its (diagonal) descent. If the angle of depression to the helipad is 38°, what is the helicopter's altitude?

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Hint: tanx=perpendicular/base

Perpendicular means altitude

I don't know if "a" is right

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