
John K. answered 08/20/14
Tutor
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Effective Specialist in Never-Been-Good-at-Math situations
Since you are given the angle of inclination and the height of building B, you can use the definition of the tangent function to find the distance x between buildings A and B.
tan(angle) = (opposite side)/(adjacent side)
tan(14.9°) = 1453ft./x, so x = 1453ft./tan(14.9°) ≅ 5,461ft.