A boat going parallel to shore spots a lighthouse ahead on shore. The angle of the line from lighthouse to boat is 30 degrees. The boat sails 3mi, and now angle is 90. How far offshore is boat?
Trig to determine distance: boat on course parallel to shore.
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trigonometry
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2Draw it out first. Can you see how the boat's path in the problem forms a triangle? – 2012-09-21
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030 degrees between the line and the shore, presumably? – 2012-09-21