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A sperical balloon of radius r subtends ...

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

A

`rcos((beta)/(2))sinalpha`

B

`rcosecbetasin((alpha)/(2))`

C

`rcosec((alpha)/(2))sinbeta`

D

`rcosec((alpha)/(2)sin((beta)/(2))`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-HEIGHTS AND DISTANCES-PRACTICE SHEET Exercise-I (Level-I) (Straight Objective Type Questions)
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  14. From a point E on the horizontal due to east of a tree, the top of the...

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  15. A vertical pole subtends an angle Tan^-1(1/2) at a point P on the grou...

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  16. The height of a hill is 3300 mts. From the point p on the ground the a...

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  18. A spherical balloon of radius 5 subtends an angle 60^(@) at a point on...

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  19. A person in aballoon, who has ascended verticallly from flat land at t...

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  20. A sperical balloon of radius r subtends an angle alpha at the eye of a...

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