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IF cos A=(sin B)/(2 sin C), then Delta A...

IF `cos A=(sin B)/(2 sin C)`, then `Delta ABC` is

A

isosceles

B

equilateral

C

right angled

D

none

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PROPERTIES OF TRIANGLES -EXERCISE 1A
  1. IF Delta ABC, if cot""A/2=(b+c)/a, then the triangle is

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  2. In a triangle ABC if (cos A)/a=(cos B)/b= (cos C)/c, then Delta ABC is

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  3. IF cos A=(sin B)/(2 sin C), then Delta ABC is

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  4. In a triangle ABC if sin A sin B=ab//c^2, then the triangle is

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  5. In Delta ABC, if sin C=(sin A)/(2 cos B) then the triangle is

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  6. In Delta ABC, if 2 cos B=a//c, then the triangle is

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  7. IF a cos B=b cos A, then Delta ABC is

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  8. In Delta ABC if a^2+b^2+c^2=ca+ab sqrt3 then the triangle is

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  9. In Delta ABC, if cos A cos B+ sin A sin B sin C=1, then the triangle i...

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  10. In Delta ABC, if cos A cos B+ sin A sin B sin C=1, then a:b:c=

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  11. In Delta ABC, if sin A cos B=1//4 and 3 tan A=tan B, the triangle is r...

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  12. In a triangle ABC if cot A=(x^3+x^2+x)^(1//2), cot B=(x+x^-1+1)^(1//2)...

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  13. The radius of the circumcircle of an isosceles triangle PQR is equal t...

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  14. The perimeter of a Delta ABC is 6 times the A.M. of the sines of its a...

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  15. If sin A= sin^2 B and 2 cos^2 A=3 cos^2 B, then the Delta ABC is

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  16. In Delta ABC, if (sin A+sin B+sin C) (sin A+ sin B- sin C)=3 sin A sin...

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  17. In Delta ABC, if sin A+sin B+sin C=1+sqrt2 and cos A+cos B+cos C=sqrt2...

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  18. IF ABC is the triangle then one root of x^2-2bx cos A+b^2-a^2=0 is

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  19. In Delta ABC sum(sin^2A+sinA+1)/(sinA) is always greater than

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  20. In DeltaABCprod((sin^2A+sinA+1)/(sinA)) is always greater than

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