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If I1 is the centre of the first escr...

If ` I_1 ` is the centre of the first escribed circle , then the value of ` ( AI_1)/( r_1) ` =

A

` sin ( A//2) `

B

` cosec (A//2) `

C

` cos ( A//2) `

D

` sec ( A//2) `

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The correct Answer is:
B
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. In an equilateral triangle ABC, P1 is length of altitude from A ...

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  2. a( r r 1 +r2r3) =

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  3. ( r1+ r2) (r2+r3) (r3+r1) =

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  4. If I1 is the centre of the first escribed circle , then the value ...

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  5. In Delta ABC , if 2R = r1 -r " then " angle A =

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  6. In Delta ABC , if r1= 3 r2 = 10 , r3 = 15, then R =

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  7. In Delta ABC , if r= 1 , r1 =2 r2 =3 , r3 = 6 then a=

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  8. In Delta ABC, if r1= 3 , r2 = 10 , r3 =15 , then c=

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  9. In Delta ABC, a= 26 , b= 30 cos "" C = (63)/( 65) , " then" r1:r2...

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  10. In Delta ABC , (1)/(r^(2)) + (1)/( r1^(2)) +(1)/( r2^(2)) + (1)/(r3^(...

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  11. In Delta ABC, r1 r2 =r r3 =

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  12. In Delta ABC , if (1- (r1)/(r2)) (1- ( r1)/( r3)) = 2, then the tria...

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  13. ( ( 1)/(r1) + (1)/(r2)) ((1)/(r2) +(1)/(r3))( (1)/(r3)+(1)/(r1)) =

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  14. Which of the following statement is true : Statement -I : In Delt...

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  15. If a= 30, b = 18, c = 24 then the descending order of r1, r2,r3 ...

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  16. If a = 18, b=24, c= 30 and if l = r2- r1 , m = r3 - r2 , n= r3 - r1 ...

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  17. Match of the following

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  18. Assertion (A) : The radius of the circle inscribed in the triangle ...

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  19. Assertion (A) : In Delta ABC if angle B = pi//2 then the diameter o...

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  20. If the angles of elevation of the top of a tower from three collinear ...

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