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The angle of elevation of the top of the...

The angle of elevation of the top of the tower observed from each of the three points A,B,C on the ground, forming a triangle is the same anlge `alpha`. IF R is the circumradius of the `Delta ABC`, then the height of the tower is

A

`R sin alpha`

B

`R cos alpha`

C

`R cot alpha`

D

`R tan alpha`

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1C
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  2. The angle of elevation of a cloud from a point h mt above the surface ...

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  3. The angle of elevation of a stationary cloud from a point 2500 mt abov...

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  4. The angle of elevation of the top of the tower observed from each of t...

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  5. A person stading on the bank of a river observerves that the angle of ...

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  6. ABC is a triangular park with AB=AC=100 meters. A clock tower is situa...

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  7. An aeroplane flying with uniform speed horizontally one kilometer abov...

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  8. The upper 3//4^(th) portion of a vertical pole subtends an angle "Tan"...

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  9. A vertical pole subtends an angle Tan^-1(1/2) at a point P on the grou...

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  10. The angle of elevation of a stationar cloud from a point 2500 m above ...

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

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  12. A tree stands vertically on the slant of the hills From a point A on t...

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  13. An object is placed at a distance of 10 cm from a convex mirror of foc...

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  14. Two ships leave a port at the same time . One goes 24km per hour in th...

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  15. Two trees A and B are on the same side of a river. From a point C in t...

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

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

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

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  19. A bird is sitting on the top of a vertical pole 20 m high and its elev...

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  20. ABCD is a trapezium such that AB and CD are parallel and BC bot CD. If...

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