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r^(2) cot ""(A)/(2) cot ""(B)/(2) cot "...

` r^(2) cot ""(A)/(2) cot ""(B)/(2) cot ""(C)/(2) `

A

` Delta `

B

` 2 Delta `

C

` 3 Dela `

D

` 4 Delta `

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The correct Answer is:
A
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. If 2( r+R ) = b+ c then A =

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  2. In Delta ABC , (sqrt( r r1r2r3))/( 2Rr ( sin A + sin B + sin C) ) =

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  3. r^(2) cot ""(A)/(2) cot ""(B)/(2) cot ""(C)/(2)

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  4. In DeltaABC,(b-c)/r1+(c-a)/r2+(a-b)/r3=

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  5. The perimeter of a triangle is equal to the diameter of the escribed ...

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  6. r1^(2) = r1r2+ r2r3 +r3r1 triangle is

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  7. In Delta ABC if a: b: c = 3: 7 : 8 then the ratio of circum radius...

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  8. In Delta ABC, (ab-r1 r2)/r3=

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  9. In Delta ABC , if r1 = 8, r2=12 , r3 = 24 then the value of sin B=

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  10. If a = 18 , b= 24 , c= 30 " then" r2 r1 is

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  11. If the sides of a triangle are xy + yz , yz +zx , zx+ xy then inradi...

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  12. If r1 , r2 , r3 are the radii of the escribed circles of a Delta ABC ...

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  13. In a Delta ABC if angle A=90^@, then cos^(-1)(( R)/(r2 +r3)) is equal

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  14. In Delta ABC if a= 26 , b = 30 , cos C ""( 63)/( 65) " then " r2...

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  15. In Delta ABC ( ( s-a))/( Delta) = (1)/( 8) , ( ( s-b))/( Delta ) = (...

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  16. (r1)/( R ) =sin A + sin B + sin C then the triangles is

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  17. In Delta ABC if ( r1+s)/( r1) =sqrt2 " then " (b^(2) +c^(2) -a^(2))/(...

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  18. In Delta ABC if ( r1+s)/( r1) =sqrt2 " then " (b^(2) +c^(2) -a^(2))/(...

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  19. In triangle ABC if Delta = 96, r1=8,r2 = 12 r3= 24 then the greatest...

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  20. In Delta ABC , ( Delta ^(2))/( a^(2) + b^(2) + C^(2)) {(1)/( r1^(2) ...

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