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Two persons are a metres a part and the height of one is double that of the other. If from the middle point of the line joining their feet, an observer finds the angular elevation of their tops to be complementary then the height of the shorten post is____

A

a/2

B

`(a)/(2sqrt2)`

C

(a)/(sqrt2)`

D

`asqrt2`

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UNITED BOOK HOUSE-Application of Trigonnometric Ratios : Heights of Distance-Exercise
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  3. An observer of 1.6m tall is 20sqrt3 away from a tower. The angle of e...

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  4. When a point is observed, the angle formed by the line of sight with t...

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  5. When we lower our head to look at the object, the angle formed by the ...

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  6. When the length of the shadow of a pillar is equal to its height, the ...

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  7. The tops of two poles of height 10 m and 18 m are connected with wire....

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  8. If the angle of elevation of the top of a tower from two points distan...

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  9. If the angles of elevation of a tower from two points distance a and b...

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  10. Two persons are a metres a part and the height of one is double that o...

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

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  12. A tower subtends an angle of 30^@ at a point on the same level as its ...

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  13. From a light house the angles of depression of two ships on opposite s...

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  14. The angle of elevation of the top of a tower standing on a horizontal ...

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  15. It is found that on walking x metres towards a chimney in a horizontal...

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  16. From the top of a cliff 25 m high the angle of elevation of a tower is...

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  17. Find the angle of depression of a boat from the bridge at a horizontal...

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  18. In the figure D is the midpoint of BC, angleCAB = alpha, angleDAB = be...

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  19. The length of the shadow of a tower standing on level ground is found ...

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

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