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Polar coordinate problem

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After taking off, a helicopter climbs in a straight line at a constant angle B. Its flight is tracked by radar from point A. Determine the speed of the helicopter in terms of d, B, p and p dot.

I know that in polar coordinates: v=r(p dot)

I know I need to get r in terms of d, B, p and p dot. I have been trying different geometry techniques but can't seem to get the answer. The answer is supposed to be:
[(p dot)d(sinB)] / [(sin^2(B-p)]

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The solution discusses polar coordinates and how to find geometry shapes within them.

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