1.

A sperical balloon of radius r subtends an angle alpha at the eye of an observer, while the angle of elevation of its centre is beta. The height of the centre of the ballon is

Answer»

`r COS(beta/2)sinalpha`
`rcosec betasin(alpha/2)`
`r cosec (alpha/2)sinbeta`
`r cosec(alpha/2) sin(beta/2)`

ANSWER :B


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