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If the incircel of the triangle ABC, thr...

If the incircel of the triangle ABC, through it's circumcentre, then the `cos A + cos B + cos C` is

A

` -2`

B

`sqrt2`

C

`-sqrt2`

D

None of these

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The correct Answer is:
B
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ARIHANT MATHS-PROPERTIES AND SOLUTION OF TRIANGLES -Exercise (Single Option Correct Type Questions)
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  9. A triangle is inscribed in a circle. The vertices of the triangle divi...

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  10. If a,b and c are the sides of a traiangle such that b.c =lamda ^(2), t...

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  12. In triangle ABC, a=5, b=4 and cos(A+B)=(31)/(32) In this triangle,c=

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  13. In a A B C ,ifA B=x , B C=x+1,/C=pi/3 , then the least integer value ...

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  14. In an equilateral triangle, three coins of radii 1 unit each are kept ...

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  15. The sides of a triangle are in AP. If the angles A and C are the great...

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  16. If in Delta ABC, c(a+b) cos ""B/2=b (a+c) cos ""C/2, the triangle is

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  17. In a triangle ABC , the line joining the circumcentre and incentre is ...

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  18. In the given figure, AB is the diameter of the circle, centered at O. ...

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  19. If in a DeltaABC, AD, BE and CF are the altitudes and R is the circumr...

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