Posted by Cyndy on Tuesday, July 31, 2012 at 10:42pm.
A hill in Colorado makes an angle of 15.0° with the horizontal and has a building at the top. At a point
75.0 feet down the hill from the base of the building, the angle of elevation to the top of the building is
55.0°. What is the height of the building?
A. 84.0 feet
B. 179 feet
C. 31.3 feet
D. 126 feet

Trigonometry  MathMate, Tuesday, July 31, 2012 at 10:57pm
You will need to draw a diagram of the objects, and be familiar with the trigonometric ratios.
Measuring everything from the point 75' down, the height of the base of the building is
B=75 sin(15°)
The horizontal distance from the base is
H=75cos(15°)
The top of the building is
T=Htan(55°)
The height of the building is the difference between the top and bottom, or
height=TB
The height as calculated above should agree with one of the four choices.
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