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A spherical balloon of radius r subtends...

A spherical balloon of radius r subtends an angle 'theta' at an observer's eye. The angle of elevation of centre of the balloon is `phi`. Prove that the height of the centre of the ball is `rsinphi cosec""theta/2`.

A

`(r sin beta)/(sin ""((alpha )/( 2 )))`

B

`(r sin beta)/( sin ((alpha )/(4)))`

C

`(r sin "" ((beta)/(2)))/( sin alpha )`

D

`( r sin alpha )/( sin "" ((beta)/(2)))`

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The correct Answer is:
A
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