Posted by john on Monday, February 11, 2013 at 11:25pm.
From a point A is 8.20 meters above level ground,the angle of elevation of the top of a building is 31degrees 20 min and the angle of depression of the base of the building is 12degree 50 min. Approximate the heighth of the building

Pre cal  Steve, Tuesday, February 12, 2013 at 12:22am
If the distance of A is d, and the building's height is h,
(h8.2)/d = tan 31°20'
8.2/d = tan 12°50'
so, equating d,
(h8.2)/tan 31°20' = 8.2/tan 12°50'
(h8.2)/.6088 = 8.2/.2278
h = 30.11 m
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