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A person standing on the bank of a river...

A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is `60^(@)`. When he retires 40m from the bank, he finds the angle to be `30^(@)`. The breadth of the river is

A

10 m

B

15 m

C

20 m

D

25 m

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VGS PUBLICATION-BRILLIANT-APPLICATIONS OF TRIGONOMETRY-EXERCISE
  1. The upper part of a tree is broken by wind and makes an angle of 30^(@...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. If AB=4m, and AC=8m, then the angle of elevation of A as observed from...

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  18. If a pole height 6m casts a shadow 2sqrt(3)m long on the ground, then ...

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  19. Find the elevation of the sun at the moment when the length of the sha...

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  20. If the shadow of a tree is (1)/(sqrt(3)) times the height of the tree,...

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