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If 2( r+R ) = b+ c then A =...

If 2( r+R ) = b+ c then A =

A

` 60 ^(@) `

B

` 30 ^(@) `

C

` 90 ^(@) `

D

` 45 ^(@) `

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. Prove that in Delta ABC S (( r1- r2) /( a) + ( r2- r)/( b) + ( r3...

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  2. In Delta ABC, if r-1,R=4, Delta =8, then ab+bc+ca=

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  3. If 2( r+R ) = b+ c then A =

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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