A plane is flying at an elevation of 20000 feet.
It is within sight of the airport and the pilot finds that the angle of depression to the airport is 23 degrees. find the distance between the plane and the airport.

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tan(23) = x/20000 is the ground distance; but do you want the actual distance from plane to airport?

cos(23) = 20000/r
r = 20000/cos(23)

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