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The line of sight from a small boat to the light at the top of a 45-foot
lighthouse built on a cliff 25 feet above the water makes a 39 degree angle with the water.
To the nearest foot, how far is the boat from the cliff?
Let d = distance to the base of the cliff (side adjacent to 39 degree angle)
25 + 45 = 70'; height of lighthouse, side opposite 39 degree angle
d = 86 ft from the base of the cliff
Distance from the boat to the cliff (c) itself which is 25' ft above the base, use pythag
c^2 = 25^2 + 86^2
c = 89.6 ft