Tan

A person is watching a boat from the top of a lighthouse. The boat is approaching the lighthouse directly. When first noticed the angle of depression to the boat is 18°33'. When the boat stops, the angle of depression is 51°33'. The lighthouse is 200 feet tall. How far did the boat travel from when it was first noticed until it stopped? Round your answer to the hundredths place.

Is the answer -706.44 ft?

Let me know if 596.01' - 158.8' = 437.21' is correct.

Yes it is.

So the answer is 437.21?

so I divide 200 by tan(18+33/60)-tan(51+33/60)

Is that right?

So the answer is -706.44 ft?

see http://mathhelpforum.com/trigonometr...tml#post743734