Home
Class 12
MATHS
If in a DeltaABC, cos B = (sin A)/(2 sin...

If in a `Delta`ABC, cos B = (sin A)/(2 sin C), then the triangle is

A

equilateral

B

isosceles

C

right angled

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    ML KHANNA|Exercise Problem Set (5)(FILL IN THE BLANKS)|3 Videos

  • PROGRESSIONS

    ML KHANNA|Exercise MISCELLANEOUS EXERCISE (ASSERTION/REASON) |1 Videos

  • RECTANGULAR CARTESIAN CO-ORDINATE SYSTEM AND THE STRAIGHT LINE

    ML KHANNA|Exercise COMPREHENSION |11 Videos

Similar Questions

Explore conceptually related problems

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

In a triangle ABC, if cos A=(sin B)/(2sin C), show that the triangle is isosceles.

In any triangle ABC, if (cos A + 2 cos C)/(cos A + 2 cos B) = (sin B)/(sin C) then prove that, the triangle is either isosceles or right angled.

In Delta ABC, if sin^(2)A+sin^(2)B=sin^(2)C then the triangle is

In a Delta ABC, if 4cos A cos B+sin2A+sin2B+sin2C=4 then triangle ABC is

in a Delta ABC,3sin A+4cos B=6 and 3cos A+4sin B=1 then angle C is

If in a Delta ABC,sin A,sin B,sin C are in AP then

In a triangle ABC, if sin A sin B= (ab)/(c^(2)) , then the triangle is :

ML KHANNA-PROPERTIES OF TRIANGLES -Self Assessment Test (Multiple Choise Questions)
  1. In Delta ABC if a= 16 , b= 24 and c = 20 then cos (B/2)

    Text Solution

    |

  2. In Delta ABC, cscA (sin B cos C + cos B sin C) =

    Text Solution

    |

  3. If in a triangles a cos^(2)(C/2)+c cos^(2)(A/2)=(3b)/2, then the sides...

    Text Solution

    |

  4. In triangleABC, If the anlges are in A.P., and b:c=sqrt(3):sqrt(2), t...

    Text Solution

    |

  5. If the angles of a triangle are in the ratio 2 : 3 : 7 ,then the sides...

    Text Solution

    |

  6. If in a right angled triangle the hypotenuse is four times as long as ...

    Text Solution

    |

  7. If the lengths of the sides of a triangle are 3, 5, 7, then its larges...

    Text Solution

    |

  8. In a triangle ABC, right angled at C, find the value of tan A + tan B ...

    Text Solution

    |

  9. The smallest angle of the DeltaABC, when a=7,b=4sqrt(3)andc=sqrt(13) i...

    Text Solution

    |

  10. If in a DeltaABC, cos B = (sin A)/(2 sin C), then the triangle is

    Text Solution

    |

  11. Find the value of tan A, if area of Delta ABC is a^(2) -(b-c)^(2).

    Text Solution

    |

  12. If c^(2)=a^(2) +b^(2), then 4s(s-a)(s-b)(s-c) is equal to

    Text Solution

    |

  13. In a triangle PQR, angleR = pi //2. If tan (P/2) and tan (Q/2) are th...

    Text Solution

    |

  14. If in a Delta PQR, sin P, sin Q , sin R are in AP, then:

    Text Solution

    |

  15. In DeltaABC if (sinA)/(sinC)=(sin(A-B))/(sin(B-C)), then a^(2), b^(2)...

    Text Solution

    |

  16. Let PQR be a triangle of ! area with a = 2 , b = 7/2 and c = 5/2, wher...

    Text Solution

    |

  17. If R is the radius of the circumcircle of the Delta ABC and Delta is ...

    Text Solution

    |

  18. In a triangle ABC if b=2,B=30^@ then the area of the circumcircle of ...

    Text Solution

    |

  19. For a regular polygon let r and R be radii of the inscribed and the ci...

    Text Solution

    |

  20. The x -coordinate of the incentre of the triangle that has the coordin...

    Text Solution

    |