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Mathematics 10 Online
OpenStudy (anonymous):

The angle of depression from the top of a lighthouse to a boat in the water is 30°. If the lighthouse is 89 feet tall how far is the boat from the lighthouse to the nearest foot?

OpenStudy (mathstudent55):

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OpenStudy (mathstudent55):

You have a 30-60-90 traingle with known shorter leg. You're looking for the longer leg. The ratio of the lengths of the sides of a 30-60-90 triangle is: short leg:long leg:hypotenuse 1:sqrt(3):2

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