Home
Class 12
MATHS
If, in a /\ ABC, (2 cos A)/a + (cos B)...

If, in a `/_\ ABC`,
`(2 cos A)/a + (cos B)/(b) + (2 cos C)/(c) = a/(bc) + b/(ca)`,
then: `/_A = .....`

A

isosceles

B

right angled

C

equilateral

D

obtuse-angled

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS - PART - B : MASTERING THE BEST|58 Videos

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS - PART-B: MASTERING THE BEST|27 Videos

  • TRIGONOMETRIC FUNCTIONS

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS - PART - A : BUILDING-UP THE BASE|152 Videos

  • THREE DIMENSIONAL GEOMETRY

    MARVEL PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS|39 Videos

  • VECTORS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|20 Videos

Similar Questions

Explore conceptually related problems

In Delta ABC If: 2(cosA)/a + (cos B)/(b) + 2(cosC)/(c) = a/(bc) + b/(ca) , then: /_A =

In a triangle ABC If (2cos A)/(a)+(cos B)/(b)+(2cos C)/(c)=(a)/(bc)+(b)/(ca) find the angle A .

(cos A)/(a)+(cos B)/(b)+(cos C)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)

In a Delta ABC(cos C+cos A)/(c+a)+(cos B)/(b) is

If in a triangle ABC,(2cos A)/(a)+(cos B)/(b)+(2cos C)/(b)=(a)/(bc)+(b)/(ca), then prove that the triangle is right angled.

In Delta ABC,(cos C+cos A)/(c+a)+(cos B)/(b)=

If in a triangle ABC, 2 (cos A)/(a) +(cos B)/(b)+2(cos C)/c=(a)/(bc)+b/(ca) then the value of the angle A is

If in a triangle ABC, (1 + cos A)/(a) + (1 + cos B)/(b) + (1+ cos C)/(c) = (k^(2) (1 + cos A) (1 + cos B) (1 + cos C))/(abc) , then k is equal to

MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MULTIPLE CHOICE QUESTIONS - PART - A : BUILDING-UP THE BASE (B) Properties of triangles
  1. In Delta ABC a cdot sin(B - C) + b cdot sin (C - A) + c cdot sin (A ...

    Text Solution

    |

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

    Text Solution

    |

  3. If, in a /\ ABC, (2 cos A)/a + (cos B)/(b) + (2 cos C)/(c) = a/(bc) ...

    Text Solution

    |

  4. In Delta ABC (b-c) cdot sin A + (c - a) cdot sin B + (a - b) cdot si...

    Text Solution

    |

  5. In any triangle A B C , prove that following: \ (cos^2B-cos^2C)/(b+c)+...

    Text Solution

    |

  6. If the sides of a triangle are x, y and sqrt((x^(2) + xy + y^(2))), t...

    Text Solution

    |

  7. In any DeltaABC, prove that : (a^2 sin (B-C))/(sin B + sin C) + (b^2 s...

    Text Solution

    |

  8. In any DeltaABC, prove that : (b+c) cos A + (c+a) cos B + (a+b) cos C ...

    Text Solution

    |

  9. If theta is real , then: c cdot cos(A - theta) + a cdot cos(C + theta)...

    Text Solution

    |

  10. In Delta ABC, (cot B + cot C)/(cot C + cot A) = ....

    Text Solution

    |

  11. If : 2 sin B cdot cos C = sin A, then Delta ABC is

    Text Solution

    |

  12. If A = 3B and a = 2b, then :m /B = ...

    Text Solution

    |

  13. If mangleA = 60^(@), then (a+b+c)(-a+b+c)=….

    Text Solution

    |

  14. If a ,c , b are in A.P., then : a cos B - b cos A = ........

    Text Solution

    |

  15. In Delta ABC,(cos 2A)/(a^2) - (cos2B)/(b^2) = ......

    Text Solution

    |

  16. In Delta ABC, (tan B)/(tan C) = .........

    Text Solution

    |

  17. In a triangleABC, a^(2) sin 2C+c^(2) sin 2A=

    Text Solution

    |

  18. If Delta ABC is right -angled at C, then: (a^2 + b^2)/(a^2 - b^2) cd...

    Text Solution

    |

  19. If the angles A,B,C of Delta ABC are in A.P. And its sides a,b,c are i...

    Text Solution

    |

  20. If p1,p2,p3 are the lengths of the altitudes ofa tringle from the ver...

    Text Solution

    |