Homework Help: Math

Posted by Barnie on Monday, April 18, 2011 at 1:42pm.

From the top of a lighthouse 210 feet high, the angle if depression to a boat is 27 degress. Find the distance from the boat to the food of the lighthouse. The lighthouse was built at sea level.

Math - Henry, Wednesday, April 20, 2011 at 2:28pm
Draw a rectangle with the long sides
hor and the short sides(210ft) ver.
Draw a diagonal from the upper left hand corner to the lower rt corner.

The angle between the diagonal and the
top hor side is the angle of depression.

tan27 = Y/X,
tan27 = 210/X,
X = 210 / tan27 = 412ft = dist. from
boat to foot of lighthouse.

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