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The angle of elevation of the top of a T...

The angle of elevation of the top of a TV tower from three points A,B and C in a straight line through the foot of the tower are `alpha,2alphaand3alpha` respectively . If `AB=a` , the height of the tower is

A

`a sin alpha`

B

`a tan alpha`

C

`a sin 3 alpha`

D

`a sin 2 alpha`

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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