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In a triange, the line joining the circu...

In a triange, the line joining the circumcentre to the incentre is parallel to BC, then `cos B + cos C ` is equal to

A

`3//2`

B

1

C

`3//4`

D

`1//2`

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The correct Answer is:
B
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OBJECTIVE RD SHARMA ENGLISH-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Exercise
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  2. In triangleABC, tanA/2=5/6, tanC/2=2/5, then

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  3. In a triange, the line joining the circumcentre to the incentre is par...

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  4. In a triangle ABC,r=

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  5. The exradii r(1), r(2), and r(3) " of " Delta ABC are in H.P. show tha...

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  6. In any triangle A B C , prove that: a^3cos(B-C)+b^3cos(C-A)+c^3cos(A-B...

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  7. If c^(2)=a^(2)+b^(2), 2s = a+b+c, then 4s(s-a)(s-b)(s-c)=

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  8. The sides of a triangle are 13,14,15, then the radius of its in-circle...

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  9. If a cos A =b cos B, then the triangle is

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  10. The in-radius of the triangle whose sides are 3,5,6,is

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  11. In an equliateral triangle of side 2sqrt3 cm. The find circum-radius.

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  12. If the angle opf a triangle are in the ratio 1:2:3, then show that the...

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  13. In any DeltaABC, prod((sin^(2)A+sin A+1)/(sin A)) is always greater th...

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  14. In any DeltaABC, prod((sin^(2)A+sin A+1)/(sin A)) is always greater th...

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  15. In a right angled triangle ABC sin^(2)A+sin^(2)B+sin^(2)C=

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  16. In any DeltaABC, is 2 cos B=a/2, then the triangle is

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  17. If in a triangle ABC ,a sin A=b sin B, then the triangle, is

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  18. In any Delta ABC, If cot ""A/2 , cot ""B/2 ,cot ""C/2 are in AP, t...

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  19. In any triangle ABC b^(2)sin2C+c^(2)sin2B=

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  20. If in a triangle ABC, (cosA)/a=(cosB)/b=(cosC)/c,then the triangle is

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