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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.

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The correct Answer is:
`r" cosec"(alpha)/(2)sinbeta`
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ML KHANNA-HEIGHTS AND DISTANCES-Problem Set (1) FILL IN THE BLANKS
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  10. From the top of a cliff 200 ft. high, the angles of depression of the ...

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  11. A balloon moving in a straight line passes vertically above two points...

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  12. A balloon moving in a straight line passes vertically above two points...

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  13. A vertical pole (more than 100 ft. high) consists of two portions the ...

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  14. The angles of elevation of the top of a tower standing on a horizontal...

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  15. A tower of x metres height has flag staff at its top. The tower and th...

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  16. A wireless pole 25 metres high is fixed on a top of a verandah of a ho...

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  17. A round balloon of radius 'r' subtends an angle alpha at the eye of th...

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  18. A stationary balloon is observed from three points A, B and C on the p...

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  19. From the top of a pole of height h, the angle of elevation of the top ...

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  20. A tower subtends an angle alpha at a point in the plane of its base a...

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