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The angle of elevation of an electric po...

The angle of elevation of an electric pole from a point A on the ground is `60^(@)` and from a Point B towards the pole on the line joining the foot of the pole to the point A, is `75^(@)`. If the distance AB = a, then the height of the pole is

A

`(a(3+2sqrt(3)))/(2)`

B

`a(4+2sqrt(3))`

C

`(a(2+sqrt(3)))/(2)`

D

`(a(2sqrt(3)-3))/(2)`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-HEIGHTS AND DISTANCES-PRACTICE SHEET Exercise-I (Level-I) (Straight Objective Type Questions)
  1. The angle of elevation of an electric pole from a point A on the groun...

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  2. A man standing on a level plane observes the anlge of elevation of top...

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

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  4. From a point on the level ground, the angle of elevation of the top of...

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  5. The angle of elevation of an object from a point P on the level ground...

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  6. The elevation of an object on a hill is observed from a certain point...

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  7. The sum of angles of elevation of the top of a tower from two points d...

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  8. Two pillars of equal height stand at a distance of 100 metres. At a po...

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  9. The angle of elevation of the top of an unfinished tower from a point ...

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  10. In a prison wall there is a window of 1 metre height, 14 metres from t...

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  11. The angles of elevation of a tower from two points which are at distan...

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  12. The angle of elevation of the top of a tower from the top and botton o...

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  13. A flag staff of length 'd' stands on tower of height h. IF at a point ...

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  14. The tops of two poles of heights 10 metres and 12 metres are connected...

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  15. At a certain point the angle of elevation of a tower is found to be co...

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  16. The length of the shadow of vertical pole of height h, thrown by the s...

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

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  18. From the top of a tree, a man observes the angle of deppression of a p...

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  19. From the top of a chiff 30 metres high, the angle of elevation of the ...

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  20. A tower subtends an angle alpha at a point A on the same level as the ...

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