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In DeltaABC, the joining the circumcentr...

In `DeltaABC`, the joining the circumcentre and incenre is parallel to BC then the value of `cos B+cosC=`

A

`1//2`

B

`3//4`

C

1

D

`3//2`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-REVISION EXERCISE-PROPERTIES OF TRIANGLES
  1. In Delta ABC, if (a-b) (s-c)= (b-c) (s-a) then r1,r2,r3 are in

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  2. In Delta ABC the roots of the equation x^3-(r+4R)x^2+s^2x-s^2r=0 are

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  3. In DeltaABC, the joining the circumcentre and incenre is parallel to B...

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  4. The sum of the radii of inscribed and circumscribed circles for an n s...

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  5. Ratio of area of the incircle to the area of triangle ABC

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  6. If the area of the triangle ABC is a^(2)-(b-c)^(2) then its circumradi...

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  7. If for DeltaABC, cotA cotB cotC gt0 then the triangle is

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  8. In Delta ABC, if c(a+b) cos B//2=b (a+c) cos C//2, then the triangle i...

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  9. In DeltaABC if tan A+ c tan C=(a+c) not ((B)/(2)) then the triangle i...

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  10. The area of the right angled triangle in terms of its circum radius an...

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  11. The angle of elevation of the top of the tower observed from each of t...

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  12. ABC is a triangular park with AB=AC=100 meters. A clock tower is situa...

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  13. A Tower stands at the centre of a circular park. A and B are two point...

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  14. If each side of length a of an equilateral triangle subtends an angle ...

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  15. A pole of height h stands at one corner of a park in the shape of an e...

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  16. A tower of height h standing at the centre of a square with sides of l...

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  17. The elevation of a tower due north of a station A is alpha and at anot...

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  18. The height of the tower vertically at the ortho centre of the triangle...

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  19. Assertion (A) : In a Delta ABC if r(1)=2r(2)=3r(3) then a:b=5:4 Reas...

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  20. In any triangle ABC, r(1),r(2)+r(2)r(3)+r(3)r(1)=....

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