Home
Class 11
MATHS
In Delta ABC , if A = 3C " then " (a...

In ` Delta ABC , if A = 3C " then " (a-c)/( 2c ) = `

A

` sin ((B)/( 2))`

B

` sin (( C ) /( 2))`

C

` cos ((B)/(2)) `

D

` cos (( C )/(2))`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise PRACTICE EXERCISE|132 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise LECTURE SHEET EXERCISE - I ( Straight Objective Type Questions ) |58 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise EXERCISE - 1|98 Videos

  • PLANES

    AAKASH SERIES|Exercise ADVANCED SUBJECTIVE TYPE QUESTIONS|30 Videos

  • PROPERTIES OF VECTORS

    AAKASH SERIES|Exercise PRACTICE EXERCISES|55 Videos

Similar Questions

Explore conceptually related problems

In Delta ABC , if b=c = R then A =

In a Delta ABC , ir r_1 = 2r_2 = 3r_3 " then " (a)/(b) + ( b)/( c ) + (c )/(a) is equal to

In Delta ABC, if b=c=R then A=

In Delta ABC , if a= 2, b= 3 , c=4 then cos A =

In Delta ABC, if C=90^@ then 2(r+R)=

In Delta ABC, if A=60^@ then b/(c+a)+c/(a+b) =

In Delta ABC, if 2r_1=3r_2=r_3 , then a:b:c=

In Delta ABC , if a=3 , b=4,c=6 then ("cot" (A)/(2)+"cot" (B)/(2)+ "cot" ( C)/(2))/("cot" A + "cot" B + "cot" C)=

AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. The lengths of the two larger sides of a triangle are 10 and 9. If the...

    Text Solution

    |

  2. In Delta ABC, if B=90^@ then tan""A/2=

    Text Solution

    |

  3. In Delta ABC , if A = 3C " then " (a-c)/( 2c ) =

    Text Solution

    |

  4. Two sides of a triangle are given by the roots of the equation x^2-5x+...

    Text Solution

    |

  5. Two adjacent sides of cyclic quadrilateral are 2 and 5 and angle betwe...

    Text Solution

    |

  6. In a triangle ABC, if B=30^@ and c=sqrt3b, then A can be equal to

    Text Solution

    |

  7. In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=

    Text Solution

    |

  8. In Delta ABC , a( b^(2) + c^(2) ) cos A +b ( c^(2) +a^(2)) cos B + c(...

    Text Solution

    |

  9. (cos ^(2) ((B-C)/( 2)) )/( (b+c)^(2))+( sin ^(2)((B-C)/( 2)) )/( (b-c...

    Text Solution

    |

  10. In DeltaABC,(b-c)/(b+c)cot""A/2+(b+c)/(b-c) tan""A/2=

    Text Solution

    |

  11. If a=3,b =4,c= 5 ,then sin 2B is

    Text Solution

    |

  12. If a cos ^(2) "" (C )/(2) +c cos ^(2) "" (A)/(2) = (3b)/( 2 ) " th...

    Text Solution

    |

  13. In Delta ABC , if cos A + 2 cos B + cos C = 2 then a,b,c = in

    Text Solution

    |

  14. If sin theta = a/(b+c) then show that cos theta = (2sqrt(bc))/(b+c) co...

    Text Solution

    |

  15. If a= ( b-c) sec theta " then " tan theta =

    Text Solution

    |

  16. tan ""(A)/(2) + tan ""(B)/(2) + tan""(C )/(2) =

    Text Solution

    |

  17. ( cot ""(A)/(2) + cot ""(B)/(2)+ cot ""( C )/( 2))/( cot A + cot B + ...

    Text Solution

    |

  18. In a triangle ABC, if cot""A/2 cot""B/2=c, cot""B/2 cot""C/2=a and cot...

    Text Solution

    |

  19. If (a+ b+ c) (b+ c-a) = kbc then

    Text Solution

    |

  20. In Delta ABC ,if 5 cos C + 6 cos B = 4 and 6 cos A + 4 cos C = 5 " th...

    Text Solution

    |