1.

A vertical tower OP of height h subtends angle alpha, beta, gamma respectively at the point A, B, C on the horizontal plane through the foot O of the tower. A is due west of the tower. B is due east of A and on the same side of the tower as A. C is due south of B, then AC =

Answer»

`h(COT ALPHA - cot beta)`
`h sqrt(cot^(2)GAMMA -cot^(2)beta)`
`h sqrt(cot^(2)alpha+cot^(2)gamma-2cot alpha cot beta)`
`h sqrt(cot^(2)gamma + cot^(2) beta - 2 cot alpha cot beta)`

Answer :C


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