A vertical tower stands on a horizontal ...

A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height h. At a point on the plane, the angles of Elevation of the bottom and the top of the flag staff are `alpha and beta` respectively. Prove that the height of the tower is `(htanalpha)/(tanbeta - tanalpha)`

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ICSE-HEIGHTS AND DISTANCES -Exercise 22 C

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