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The angles of elevation of a cliff at a ...

The angles of elevation of a cliff at a point A on the ground and at a point B, 100 mt vertically at A are `alpha and beta` respectively. The height of the cliff in mt is

A

`(100 tanbeta)/(cotbeta-cotalpha)`

B

`(100 cotbeta)/(cotbeta-cotalpha)`

C

`(100 tanbeta)/(cotalpha+cotbeta)`

D

`(100 cotbeta)/(cotalpha+cotbeta)`

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1C
  1. The angles of elevation of a tower from two points which are at distan...

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  2. A flag staff on the top of the tower 80 mt of height subtends an angle...

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  3. The angles of elevation of a cliff at a point A on the ground and at a...

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  4. The top of a hill observed from the top and bottom of a building of he...

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  5. A flag staff of 5 mts high stands on a building of 25 mt high. At an o...

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  6. From the top of a building 60 m high the angle of elevation of the top...

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  7. The horizontal distance between two towers is 60m and the angular depr...

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  8. From the top of a cliff 60 mt high, the angles of depression of top an...

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  9. From the top of the hill h metres high the angles of depression of the...

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  10. These are two towers on a horizontal line. From the mid point of the l...

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  11. The angles of elevation of the tops of two vertical towers as seen fro...

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  12. P is a point on the segment joining the feet to vertical poles of heig...

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  13. A tower subtends angles alpha,2 alpha, 3 alpha respectively at points ...

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  14. The angle of elevation of a cloud from a point h mt above the surface ...

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  15. The angle of elevation of a stationary cloud from a point 2500 mt abov...

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  16. The angle of elevation of the top of the tower observed from each of t...

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  17. A person stading on the bank of a river observerves that the angle of ...

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  18. ABC is a triangular park with AB=AC=100 meters. A clock tower is situa...

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  19. An aeroplane flying with uniform speed horizontally one kilometer abov...

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  20. The upper 3//4^(th) portion of a vertical pole subtends an angle "Tan"...

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