A Plane Flying at an Altitude of a Miles Above

A plane flying at an altitude of a miles above a radar antenna will pass directly over the radar antenna (see figure) .Let d be the ground distance from the antenna to the point directly under the plane and let x be the angle of elevation to the plane from the antenna. . ​
(d is positive as the plane approaches the antenna.)
Write d as a function of x.
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A) d = 8 csc x
B) d = 8 cot x
C) d = 8 cos x
D) d = 8 tan x
E) d = 8 sin x

Correct Answer:

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