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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

`(7sqrt(3))/(2)(sqrt(3)+1)`

B

`(7sqrt(3))/(2)(sqrt(3)-1)`

C

`(7sqrt(3))/(2(sqrt(3)+1))`

D

`(7sqrt(3))/(2(sqrt(3)-1))`

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

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