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Question

In a triangle ABC, a : b : c = 4 : 5 : 6. The ratio of the radius of the circumcircle to that of the incircle is


  1. 15/4

  2. 11/5

  3. 16/7

  4. 16/3


Solution

The correct option is C

16/7


Rr=2abc(a+bc)(c+ab)(b+ca)given=2.4.5.63.5.7=167

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