Home
Class 12
MATHS
If r,r(1) ,r(2), r(3) have their usual m...

If `r,r_(1) ,r_(2), r_(3)` have their usual meanings , the value of `1/(r_(1))+1/(r_(2))+1/(r_(3))`, is

A

1

B

0

C

`1/r`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM

    OBJECTIVE RD SHARMA|Exercise Chapter Test|55 Videos

  • PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM

    OBJECTIVE RD SHARMA|Exercise Section II - Assertion Reason Type|13 Videos

  • PLANE AND STRAIGHT LINE IN SPACE

    OBJECTIVE RD SHARMA|Exercise Chapter Test|31 Videos

  • REAL FUNCTIONS

    OBJECTIVE RD SHARMA|Exercise Chapter Test|60 Videos

Similar Questions

Explore conceptually related problems

If r/(r_(1))=(r_(2))/(r_(3)) , then

In any Delta ABC,r_(1),r_(2),r_(3),r stands for its usual meaning then (1)/(r_(1))+(1)/(r_(2))+(1)/(r_(3)) is

In triangle ABC, 2b=a+c .If r_(1),r_(2),r_(3) be the exradii of the triangle,then (1)/(r_(1)),(1)/(r_(2)) and (1)/(r_(3)) are in

Value of 1/(r_(1)^2)+ 1/(r_(2)^2)+ 1/(r_(3)^2)+ 1/(r_()^2) is :

If in a triangle (r)/(r_(1)) = (r_(2))/(r_(3)) , then

The value of 1/(r_(1)^(2))+1/(r_(2)^(2))+1/(r_(2)^(3))+1/(r^(2)) , is

r+r_(3)+r_(1)-r_(2)=

In triangle ABC ,if (r_(1))/(6)=(r_(2))/(3)=(r_(3))/(2) ,where, r_(1),r_(2) and r_(3) are ex-radii, then find the value of (a)/(b)+(b)/(c)+(c)/(a) ?

In any triangle, the minimum value of r_(1) r_(2) r_(3) //r^(3) is equal to

If r_(1),r_(2),r_(3),r are in usual notation in Delta ABC then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=

OBJECTIVE RD SHARMA-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Exercise
  1. If r is the radius of inscribed circle of a regular polygon of n-sides...

    Text Solution

    |

  2. The area of a regular polygon of n sides is (where r is inradius, R is...

    Text Solution

    |

  3. If r,r(1) ,r(2), r(3) have their usual meanings , the value of 1/(r(1)...

    Text Solution

    |

  4. If p(1), p (2), p(3) are respectively the perpendicular from the verti...

    Text Solution

    |

  5. If p(1), p(2),p(3) are respectively the perpendiculars from the vertic...

    Text Solution

    |

  6. If in Delta ABC, 8R^(2) = a^(2) + b^(2) + c^(2), then the triangle ABC...

    Text Solution

    |

  7. If A(1),A(2),A(3) denote respectively the areas of an inscribed polygo...

    Text Solution

    |

  8. If the angles of a triangle are in A.P.with common difference equal 1/...

    Text Solution

    |

  9. In a triangle ABC, A = 8, b = 10 and c = 12. What is the angle C equal...

    Text Solution

    |

  10. If the sides a, b, c of a triangle ABC are the roots of the equation x...

    Text Solution

    |

  11. The area of a !ABC is b^(2)-(c-a)^(2). Then ,tan B =

    Text Solution

    |

  12. In a DeltaABC, Sin A /SinC = sin(A-B)/ sin(B - C) , then a^2, b^2, c^2...

    Text Solution

    |

  13. If in a triangle ABC, 3 sin A = 6 sin B=2sqrt3sin C, then the angle A...

    Text Solution

    |

  14. The side of a Delta are in AP. And its area is 3/5xx (area of an equil...

    Text Solution

    |

  15. In a triangle sin^(4)A + sin^(4)B + sin^(4)C = sin^(2)B sin^(2)C + 2si...

    Text Solution

    |

  16. In any triangle ABC ,(tanA/2-tanB/2)/(tanA/2+tanB/2) is equal to

    Text Solution

    |

  17. If the sides a,b and c of a !ABC are in A.P.,then (tanA/2+tanC/2):co...

    Text Solution

    |

  18. If the sides of the triangle are the roots of the equation x^(3)-2x^(...

    Text Solution

    |

  19. If AD, BE and CF are the medians of a ABC ,then (AD^(2)+BE^(2)+CF^(2))...

    Text Solution

    |

  20. If a DeltaABC is right angled at B, then the diameter of the incircle ...

    Text Solution

    |