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The angle of elevation of top of a tree ...

The angle of elevation of top of a tree is `30^(@)`. On moving 20m nearer, the angle of elevation is `60^(@)`. The height of the tree is

A

`15 sqrt 3`

B

`2 sqrt 3`

C

`10 sqrt 3`

D

`5 sqrt 3`

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BEYOND PUBLICATION-APPLICATIONS OF TRIGNOMETRY-EXERCISE
  1. At a point 15m away form the base of a 15m high pole, the angle of ele...

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  2. When the length of the shadow of a person is equal to his height, then...

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  3. The angle of elevation of top of a tree is 30^(@). On moving 20m neare...

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  4. The ratio of length of a pole and its shadow is 1:sqrt(3). The angle ...

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  5. The upper part of a tree is broken by wind and makes an angle of 30^(@...

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  6. From a bridge 25m high, the angle of depression of a boat is 45^(@). F...

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  7. A tower makes an angle of elevation equal to the angle of depression f...

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  8. When the angle of elevation of a pole is 45^(@), the length of the pol...

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  9. In a rectangle, if the angle between a diagonal and a side is 30^(@), ...

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  10. Two posts are 15 m and 25m high and the line joining their tope make a...

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  11. An electric pole 20m high stands up right on the ground with the help ...

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  12. A building casts a shadow of length 50sqrt(3) m when the sun is 30^(@)...

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  13. When the angle of elevation of a light changes from 30^(@)" to "45^(@)...

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  14. From the top of a building 50m from horizontal, the angle of depressi...

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  15. From the top of a building with height 30(sqrt(3)+1)m two cars make an...

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  16. A person standing on the bank of a river observes that the angle subte...

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  17. A ladder of 10 m length touches a wall at a height of 5 m. The angle m...

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  18. A tree breaks due to storm and the broken part bends so that the top o...

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  19. The angle of elevation of a cloud from a point 200 m above the lake is...

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  20. An aeroplane flying horizontally 1 km above the ground is observed at ...

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