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In Delta ABC if 2 cos B = ( a)/(c ) , ...

In ` Delta ABC if 2 cos B = ( a)/(c ) , `then the triangle is

A

right angled

B

equilateral

C

Isosceles

D

Right angled isosceles

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
  1. In Delta ABC , if cos ^(2)A +cos ^(2) B +cos ^(2) C =(3)/(4) , then...

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  2. In a triangles ABC if sin A sin B = ( ab)/( c^(2)) , then the trian...

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

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

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  5. In Delta ABC , pi((sin ^(2) A +sin A+1)/( sin A)) is always greater ...

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  6. sum a^(3) cos (B-C) =

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  7. In Delta ABC , if AB = 12, BC =13,CA = 5 then the distance of A fro...

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  8. If D is the mid-point of the side BC of triangle ABC and AD is perpend...

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  9. If the hypotenuse of a right angled triangle is four times the length ...

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  10. If the hypotenuse of a right angled triangle is 2sqrt2 times the le...

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  11. If 2sqrt3 is the inradius of an equilateral triangle then the leng...

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  12. The inventre of Delta ABC is the of its excentral triangle

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  13. cos ^(2) ((A)/(2)) + cos ^(2) ((B)/(2)) +cos ^(2) (( C )/(2)) =

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  14. In Delta ABC if 5r = 2R then cos A + cos B + cos C =

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  15. If p1 ,p2,p3 are the lengths of altitudes of Delta ABC from the ...

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  16. If P1 , P2 , P3 are lengths of altitudes of a triangle from its v...

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  17. In Delta ABC, if a= 30 ,b= 24, c= 18 , then r=

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  18. In Delta ABC, if a= 13, b= 14, c= 15 , then r2 =

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  19. If 2,3,6 are exradii of triangle , then its inradius is

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  20. If the area of a triangle is 6.sq units and its inradius is 2 unit...

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