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OpenStudy (anonymous):
The length of the projection of a line on a plane is 12 cm. If the length of the line is 18 cm, find the angle it makes with the plane?
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OpenStudy (anonymous):
Call the angle φ. 18 cosφ = 12 cosφ = 12/18 = 2/3 \[φ\approx48.2^{o}\]
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