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Pruned Triangle (Posted on 2017-07-28) Difficulty: 3 of 5

  
A paper triangle has its vertices cut off. Each cut is along a straight line
parallel to the side opposite the vertex and tangent to the triangle's incircle.

Prove that the triangle's inradius is equal to the sum of inradii of the
three triangles cut off.
  

See The Solution Submitted by Bractals    
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  Subject Author Date
SolutionSketch of a solutionJer2017-07-28 19:28:06
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