Home
Class 11
MATHS
If in triangleABC a=2b and angle A=3 ang...

If in `triangleABC` a=2b and `angle A=3 angleB` then `angleA=`

A

a)`90^@`

B

b)`60^@`

C

c)`45^@`

D

d)`30^@`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • TRIGONOMETRIC EQUATION AND INVERSE

    PATHFINDER|Exercise QUESTION BANK|195 Videos

  • TRIGONOMETRIC RATIOS AND IDENTITIES

    PATHFINDER|Exercise QUESTION BANK|241 Videos

Similar Questions

Explore conceptually related problems

If in triangleABC a=3cm,b=5cm and angle C=120^@ then c=

If triangleABC and triangleDEF , angleA = angleE and angleF = angleB then

If in triangleABC ,a=5cm b= 5sqrt3 and angleC=30^@ then c=

If in triangleABC a=3cm, b=5cm and c=7cm then the triangle is

If in a triangleABC, angleA=45^(@), angleB=60^(@), angleC=75^(@) , then the ratio of its sides is-

In triangleABC and triangleDEF , angleA=angleE=40^@ , AB:ED =AC:EF and angleF= 65^@,angleB =

If triangleABC and triangleDEF are similar such that angleA = 47^@, angleE = 83^@ , than angleC =

Write True or False: in triangleABC,angleB= 90^@ , if AB = BC then tanangleC = 1/sqrt3 .

PATHFINDER-TRIGONOMETRIC FUNCTIONS-QUESTION BANK
  1. If in triangle ABC if acosA=bcosB then the triangle will be

    Text Solution

    |

  2. In triangleABC if cosA=sinB/sinC then the triangle is

    Text Solution

    |

  3. If in triangleABC a=2b and angle A=3 angleB then angleA=

    Text Solution

    |

  4. If in triangleABC ,3a^2=b^2+c^2 then cotB+cotC-cotA=

    Text Solution

    |

  5. cos A/2=sqrt((b+c)/(2c)) then the correct option is

    Text Solution

    |

  6. The length of three sides of a triangle be 1cm,2cm and 3 cm then the v...

    Text Solution

    |

  7. In an isosceles triangle ABC ,angleA =120^@ ,a:b=

    Text Solution

    |

  8. In triangle ABC if sin^2B+sin^2C=sin^2A then

    Text Solution

    |

  9. If the ratio of the angles of a triangle be 1:2:3 and the circumradius...

    Text Solution

    |

  10. If in triangleABC ,a=5cm b=5sqrt3 and angleC=30^@ then c=

    Text Solution

    |

  11. If in triangle ABC ,angleC=90^@ then tanA+tan B=

    Text Solution

    |

  12. If in triangleABC a=3cm, b=5cm and c=7cm then the triangle is

    Text Solution

    |

  13. If the ratio of the length of the sides of a triangle be 1:sqrt3:2 the...

    Text Solution

    |

  14. In triangleABC if C=pi/2 then the greatest value of sinAsinB is

    Text Solution

    |

  15. If in a triangle ABC ,(a-b+c)/a=b/(b+c-a) then angleC=

    Text Solution

    |

  16. In triangleABC if c^2=a^2+b^2 then 4s(s-a)(s-b)(s-c)=

    Text Solution

    |

  17. If in triangleABC a=3cm,b=5cm and angle C=120^@ then c=

    Text Solution

    |

  18. If 2cosA=sinB/sinC then show that the triangle is an isosceles triangl...

    Text Solution

    |

  19. If (sinA)/3=(sin B)/3=(sin C)/4 then prove that cosC=1/9

    Text Solution

    |

  20. The lengths of sides of triangle ABC are a units, b units and sqrt(a^2...

    Text Solution

    |