A vertical tower stands on a horizontal plane and is surmounted by a vertical flagstaff of height h. At a point on the plane, the angles of elevation of the bottom and the top of the flagstaff are alpha and beta respectively. Prove that the height of the tower is h(tan $\beta$ +tan $\alpha$ ) / tan $\beta$ -tan $\alpha$ .

Nivedita Nair

Aug. 8, 2019, 6:11 p.m.

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