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In Delta ABC if ( r1+s)/( r1) =sqrt2 " t...

In `Delta ABC if ( r_1+s)/( r_1) =sqrt2 " then " (b^(2) +c^(2) -a^(2))/( 2bc) `

A

` ( 1)/(sqrt2) `

B

` -(1)/(sqrt2) `

C

` ( sqrt3)/(2) `

D

`-(sqrt3)/(2) `

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The correct Answer is:
A
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
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  5. In Delta ABC , ( Delta ^(2))/( a^(2) + b^(2) + C^(2)) {(1)/( r1^(2) ...

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  6. In Delta ABC , ( r1r+ r2r3)/( bc)=

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

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

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

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

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  11. In Delta ABC Macth of following

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

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

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

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

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

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

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

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

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

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