Home
Class 14
MATHS
In the adjoining figure of DeltaABC, ang...

In the adjoining figure of `DeltaABC, angleBCA=120^(@) and AB = c, BC = a, AC = b` then:

A

`c^(2)=a^(2)+b^(2)+ba`

B

`c^(2)=a^(2)+b^(2)-ba`

C

`c^(2)=a^(2)+b^(2)-2ba`

D

`c^(2)=a^(2)+b^(2)+2ab`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • GEOMETRY

    ARIHANT SSC|Exercise INTRODUCTORY EXERCISE - 12.3|28 Videos

  • GEOMETRY

    ARIHANT SSC|Exercise INTRODUCTORY EXERCISE - 12.4|10 Videos

  • GEOMETRY

    ARIHANT SSC|Exercise INTRODUCTORY EXERCISE - 12.1|45 Videos

  • FUNDAMENTALS

    ARIHANT SSC|Exercise TEST OF YOU - LEARNING - 2|40 Videos

  • HCF AND LCM

    ARIHANT SSC|Exercise Exercise Higher Skill Level Questions|18 Videos

Similar Questions

Explore conceptually related problems

In the adjoining figure, DeltaABC is right-angled at B . If /_A=30^(@) and AB=9cm , find (i) BC and (ii) AC .

In DeltaABC,angleBAC=120^(@) and AB = AC, then find measure of angleABC .

In the adjoining figure, angleABD=127^(@) and angleACE=149^(@) . Prove that AC gt AB .

In the adjoining figure, DeltaABC is right-angled at B and /_A=30^(@) . If BC=6cm , find (i) AB , (ii) AC .

In the adjoining figure, DeltaABC is an isosceles triangle in which AB = AC and AD is the bisector of angleA . Prove that: DeltaADB~=DeltaADC

In the adjoining figure, DeltaABC is an isosceles triangle in which AB = AC and AD is the bisector of angleA . Prove that: BD = CD

In the adjoining figure, DeltaABC is an isosceles triangle in which AB = AC and AD is the bisector of angleA . Prove that: ADbotBC

In the adjoining figure, DeltaABC is an isosceles triangle in which AB = AC and AD is the bisector of angleA . Prove that: angleB=angleC

In the adjoining figure, x gt y , Prove that AB gt AC

ARIHANT SSC-GEOMETRY-INTRODUCTORY EXERCISE - 12.2
  1. In the adjoining figure D, E and F are the mid - points of the sides B...

    Text Solution

    |

  2. In the adjoining figure angleBAC=60^(@) and BC = a, AC = b and AB = c,...

    Text Solution

    |

  3. In the adjoining figure of DeltaABC, angleBCA=120^(@) and AB = c, BC =...

    Text Solution

    |

  4. In a right angled DeltaABC, angleC=90^(@) and CD is the perpendicular ...

    Text Solution

    |

  5. If the medians of a triangle are equal, then the triangle is

    Text Solution

    |

  6. The incentre of a triangle is determined by the :

    Text Solution

    |

  7. The circumcentre of a triangle is determined by the :

    Text Solution

    |

  8. The point of intersection of the angle bisectors of a triangle is :

    Text Solution

    |

  9. The diagonal of the square field measures 50m. The area of square fiel...

    Text Solution

    |

  10. If in a DeltaABC,'S' is the circumcentre then :

    Text Solution

    |

  11. If AD, BE, CF are the altitudes of DeltaABC whose orthocentre is H, th...

    Text Solution

    |

  12. In a right angled DeltaABC, angleC=90^(@) and CD is the perpendicular ...

    Text Solution

    |

  13. In an equilateral triangle ABC, if a, b and c denote the lengths of pe...

    Text Solution

    |

  14. What is the ratio of side to the height of an equilateral triangle?

    Text Solution

    |

  15. The triangle is formed by joining the mid point of the sides AB, BC an...

    Text Solution

    |

  16. One side other than the hypotenuse of right angle isosceles triangle i...

    Text Solution

    |

  17. Any two of the four triangles formed by joining the mid - points of th...

    Text Solution

    |

  18. The internal bisectors of angleB and angleC of DeltaABC meet at O. If ...

    Text Solution

    |

  19. The point in the plane of a triangle which is at equal perpendicular d...

    Text Solution

    |

  20. Incentre of a triangle lies in the interior of :

    Text Solution

    |