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General
Easy

Question

In a triangle ABC, let ÐC =fraction numerator pi over denominator 2 end fraction. If r is the in radius and R is the circumradius of the triangle, then 2(r + R) is equal to -

  1. a + b  
  2. b + c  
  3. c + a  
  4. a + b + c  

The correct answer is: a + b

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