Home
Class 11
MATHS
In DeltaABC, if (b+c-a)/(4)=(c+a-b)/(3)=...

In `DeltaABC,` if `(b+c-a)/(4)=(c+a-b)/(3)=(a+b-c)/(2)`, then `CosA=`

A

`(5)/(7)`

B

`(3)/(7)`

C

`(2)/(7)`

D

`(1)/(7)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-I) (LEVEL-II) (More than one correct answer Type Questions)|4 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-I) (LEVEL-II) (Linked Comprehension Type Questions)|3 Videos

  • PROPERTIES OF TRIANGLES

    AAKASH SERIES|Exercise PRACTICE SHEET (EXERCISE-I) (LEVEL-I) (Straight- Objective Type Questions)|55 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 DeltaABC, c (a cosB-b cosA)=

In DeltaABC if (b)/(c+a)+(c)/(a+b)=1 then

In DeltaABC,(b-c)/r_1+(c-a)/r_2+(a-b)/r_3=

In DeltaABC, if (a+b+c)(b+c-a)=3bc , then A=

In DeltaABC , if a"Cos"^(2)(C)/(2)+c"Cos"^(2)(A)/(2)=(3b)/(2) , then a, b,c are in

In DeltaABC=(b-c)/(r_(1))+(c-a)/(r_(2))+(a-b)/(r_(3))=

In any Delta ABC,((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^2c^2) =

In DeltaABC, " if" (1)/(a+c)+(1)/(b+c)=(3)/(a+b+c) then show that C=60^(@)

AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE SHEET (EXERCISE-I) (LEVEL-II) (Straight- Objective Type Questions)
  1. Equilateral triangle DEF is inscribed in equilateral triangle ABC as s...

    Text Solution

    |

  2. In triangle ABC, angle B = pi//3. " and " angle C = pi//4 . Let D div...

    Text Solution

    |

  3. In a triangle lfloor=55^(0), lfloorB=15^(0), lfloorC=110^(0) and (c^(2...

    Text Solution

    |

  4. In DeltaABC, if cosA+sinA -(2)/(cosB+sinB)=0, then the value of ((a+b)...

    Text Solution

    |

  5. In a triangle ABC if cos A.cos B.cos C=(sqrt(3)-1)/(8), sin A sinB sin...

    Text Solution

    |

  6. If sides of a triangles are in the ratio x: y : sqrt( x^(2) +xy + y...

    Text Solution

    |

  7. If two sides of a triangle are the roots of the equation 4x^2-(2sqrt6)...

    Text Solution

    |

  8. If the sides of trinangles are x^(2) + x+ 1,2 x + 1 , x^(-2) -1 wher...

    Text Solution

    |

  9. The straight roads intersect at angle of 60^@. A bus on one road is 2k...

    Text Solution

    |

  10. In DeltaABC, a^(2)+b^(2)+c^(2)=ac+ab sqrt(3). Then the triangle is

    Text Solution

    |

  11. The lengths of the two larger sides of a triangle are 10 and 9. If the...

    Text Solution

    |

  12. The roots of x^(2) - 2 sqrt 3 x+ 2=0 represent two sides of a tria...

    Text Solution

    |

  13. In triangle ABC, a=5,b=4, and cos(A+B)=(31)/(32). In this triangle c=

    Text Solution

    |

  14. If one angle of a triangle is 30^(@) and the lengths of the sides adja...

    Text Solution

    |

  15. In Delta ABC, if (2 cos A)/a+ (cos B)/b+ (2 cos C)/c=a/(bc)+b/(ca), th...

    Text Solution

    |

  16. In DeltaABC, if (b+c-a)/(4)=(c+a-b)/(3)=(a+b-c)/(2), then CosA=

    Text Solution

    |

  17. In a triangle ABC if 9(a^(2)+b^(2))=17c^(2) then (cotA+cotB)/(cotC)=

    Text Solution

    |

  18. In a triangle ABC, a^(2)+c^(2)=2002b^(2), then (cotA+cotC)/(cotB) is e...

    Text Solution

    |

  19. In DeltaABC if (sinA)/(c cosB)+(sinB)/(c)+(sinC)/(b)=(c)/(ab)+(b)/(ac)...

    Text Solution

    |

  20. In a triangle ABC if 2a= sqrt(3)b+c then

    Text Solution

    |