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A tower subtends angles alpha,2 alpha, 3...

A tower subtends angles `alpha,2 alpha, 3 alpha` respectively at points A,B and C all lying on a horizontal line through the foot of the tower, Then `(AB)/(BC)=`

A

`(sin 3alpha)/(sin 2 alpha)`

B

`1+2 cos 2 alpha`

C

`2+ cos 2 alpha`

D

`(sin 2 alpha)/(sin alpha)`

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1C
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  11. A vertical pole subtends an angle Tan^-1(1/2) at a point P on the grou...

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  12. The angle of elevation of a stationar cloud from a point 2500 m above ...

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  13. A lamp post is sittuated at the middle point M of the side AC of a tri...

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  14. A tree stands vertically on the slant of the hills From a point A on t...

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  15. An object is placed at a distance of 10 cm from a convex mirror of foc...

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  16. Two ships leave a port at the same time . One goes 24km per hour in th...

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  17. Two trees A and B are on the same side of a river. From a point C in t...

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  18. The angle of elevation of the toop point P of the vertical tower PQ of...

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  19. AB is a vertical pole with B at the ground level and and A at the top ...

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  20. A person observes the top of a tower from a point A on the ground. the...

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