1.

A vertical pole stands at a point A on the boundary of a circular park of radius a and subtends an angle alpha at another point beta on the boundary. If the chord AB subtends an angle alpha at the centre of the park, the height of the pole is

Answer»

`"2A sin"(alpha)/(2)TAN alpha`
`"2a cos" (alpha)/(2)tan alpha`
`"2a sin" (alpha)/(2)COT alpha`
`"2a cos" (alpha)/(2)cot alpha`

ANSWER :A


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