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Prove that sum (r+r1) tan ((B-C)/( 2))...

Prove that ` sum (r+r_1) tan ((B-C)/( 2))=0 `

A

` ( abc)/( Delta ^(3)) `

B

`0`

C

` 4Rr^(2) `

D

` (1)/ ( r ) `

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The correct Answer is:
B
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. In Delta ABC , ( r1r+ r2r3)/( bc)=

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  2. In Delta ABC , r1r2 sqrt([( 4R -r1-r2)/( r1+r2)]) =

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  3. Prove that sum (r+r1) tan ((B-C)/( 2))=0

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  4. In Delta ABC, the correct formule among the following are Statemen...

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  5. In Delta ABC , with usual notation observe the two statements given ...

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  6. In Delta ABC Macth of following

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  7. Assertion (A) : The angle between equal sides of an isosceles triangle...

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  8. Assertion (A) : In Delta ABC a,b, c denotes lengths of the sides an...

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  9. Statement -I : In Delta ABC , b cos ^(2) "" ( C)/(2) + c cos ^(2) ""...

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  10. In a Delta ABC , ir r1 = 2r2 = 3r3 " then " (a)/(b) + ( b)/( c ) + (...

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  11. If in a Delta ABC, r1= 2r2= 3r3, then the perimeter of the triangle ...

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  12. If in a Delta ABC , r1 =2r2=3r3, then b: c=

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  13. If cot ""(A)/(2) = 30 , Cot "" (B)/(2) = 50 , Cot "" ( C)/(2) = 70...

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  14. A tower, of x metres high, has a flagstaff at its top. The tower and t...

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

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

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

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

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  20. The upper (3)/(4) the portion of a vertical pole subtends an angle...

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