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A ladder of 20 mt long reaches a point 2...

A ladder of 20 mt long reaches a point 20 mt below the top of a flag staff. If the angle of elevation of the top of the flag staff at the foot of the ladder is ` 60 ^(@) ` then the height of the flag staff is

A

` 10 (sqrt3-1) `

B

` 300( sqrt3+1) mt`

C

` 120 ( sqrt3-1) `

D

` 30 mt `

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The correct Answer is:
D
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
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  3. A tower, of x metres high, has a flagstaff at its top. The tower and t...

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  4. A ladder of 20 mt long reaches a point 20 mt below the top of a flag s...

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  5. The angle of elevation of the toop point P of the vertical tower PQ of...

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  6. A lamp post is sittuated at the middle point M of the side AC of a tri...

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  7. A flag staff stands vertically on a pillar. The height of the flag sta...

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  8. A tower subtends angles alpha, 2alpha, 3alpha at A,B and C all lyin...

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  10. A vertical pole subtends an angle Tan ^(-1) (( 1)/(2)) at a point ...

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  12. The angle of elevation of the top of the tower is 45^(@) on walking up...

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  13. The angle of elevation of a tower from two point which are distance h...

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  14. The upper 3//4 of a ship's mast subtends at a point on the deck whic...

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  15. AB is vertical pole with B at ground level and A at the top. A man fi...

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  16. The angle of elevation of the top of the tower is 45^(@) on walking up...

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  17. The angle of a triangle ABC are in an arithmetic progression . The lar...

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  18. In Delta ABC , if x=tan((B-C)/(2))tan.(A)/(2),y=tan((C-A)/(2))tan.(B)/...

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  19. In Delta ABC, if the sides a,b,c are in geometric progression and the ...

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