1.

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

Answer»

`2a COS (alpha//2) TAN alpha`
`2a SIN (alpha//2) COT alpha`
`2a sin (alpha//2) tan alpha`
`2a cos (alpha//2) cot alpha`

Answer :C


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