The distance from the ground level to the underside of a cloud is called the ceiling. See

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The distance from the ground level to the underside of a cloud is called the ceiling. See Fig. 4.80. A ground observer 950 m from a searchlight aimed vertically notes that the angle of elevation of the spot of light on a cloud is 76°. What is the ceiling?

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Basic Technical Mathematics

ISBN: 9780137529896

12th Edition

Authors: Allyn J. Washington, Richard Evans

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