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A round balloon of radius 'r' subtends a...

A round balloon of radius 'r' subtends an angle `alpha` at the eye of the observer, while the angle of elevation of its centre is `beta`. Find the height of the centre of balloon.

A

`r cosec(alpha/2)sinbeta`

B

`r sinalphacosecbeta`

C

`r/2 sinbeta`

D

`r sec(alpha/2)`

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The correct Answer is:
A
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