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OpenStudy (anonymous):
An airplane over the Pacific sights an island at a 20° angle of depression. If the plane is 475 m above water, how many kilometers is it from a point 475 m above the island?
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OpenStudy (anonymous):
475/cos(20)
sam (.sam.):
|dw:1335366465700:dw| \[\cos20=\frac{475}{x}\] x=505.48m
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