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A round balloon of radius r subtends an ...

A round balloon of radius `r` subtends an angle at the eye of the observer while the angle of elevation of its centre is `betadot` Prove that the height of the centre of the balloon is `rsinbetacos e calpha/2dot`

A

`r "cosec "alpha sin beta/2`

B

`r sin alpha "cosec "beta/2`

C

`r sin alpha/2 "cosec" beta`

D

`r "cosec "alpha/2 sin beta`

Text Solution

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The correct Answer is:
D
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