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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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AAKASH SERIES-REVISION EXERCISE-PROPERTIES OF TRIANGLES
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  2. If the area of the triangle ABC is a^(2)-(b-c)^(2) then its circumradi...

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  3. If for DeltaABC, cotA cotB cotC gt0 then the triangle is

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  4. In Delta ABC, if c(a+b) cos B//2=b (a+c) cos C//2, then the triangle i...

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  5. In DeltaABC if tan A+ c tan C=(a+c) not ((B)/(2)) then the triangle i...

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  6. The area of the right angled triangle in terms of its circum radius an...

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

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

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  9. A Tower stands at the centre of a circular park. A and B are two point...

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  10. If each side of length a of an equilateral triangle subtends an angle ...

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  11. A pole of height h stands at one corner of a park in the shape of an e...

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  12. A tower of height h standing at the centre of a square with sides of l...

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  13. The elevation of a tower due north of a station A is alpha and at anot...

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  14. The height of the tower vertically at the ortho centre of the triangle...

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  15. Assertion (A) : In a Delta ABC if r(1)=2r(2)=3r(3) then a:b=5:4 Reas...

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  16. In any triangle ABC, r(1),r(2)+r(2)r(3)+r(3)r(1)=....

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

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  19. IF the angles of triangle are in the ratio 1:1:4 then the ratio of the...

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

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