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AB is a vertical pole with B at the grou...

AB is a vertical pole with B at the ground level and and A at the top .A man finds that the angle of elevation of the point A from a certain point C on the ground is `60^(@)` . He moves away from the pole along the line BC to a point D such that CD = 7 m .From D . the angle of elevation of the point A is `45^(@)` .Find the height of the pole .

A

`(7sqrt3)/2(sqrt3+1)m`

B

`(7sqrt3)/2(sqrt3-1)m`

C

`(7sqrt3)/21 1/(sqrt3+1)m`

D

`(7sqrt3)/21 1/(sqrt3-1)m`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1C
  1. The shadow of the tower standing on a level ground is found to be 60 m...

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

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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. A person walking along a straight road towards a hill observes at two ...

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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 angle of elevation of the top of a tower from a point on the same ...

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

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

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  9. A tower, of x metres high, has a flagstaff at its top. The tower and t...

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

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

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

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

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

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

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

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

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

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

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

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