1.

A bell tent consists of a conical portion above a cylinder portion near the ground For a given vloume and a circular base of a given radius , the amount of the canvas usedis a minimumwhenthe semi - vertical angle of the cone is

Answer»

`COS^(-1)2//3`
`SIN^(-1)2//3`
`cos^(-1)1//3`
`cos^(-1)1//2`

ANSWER :A


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