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The Contact Triangle and Two Other Subtriangles
Let ABC be a triangle. Let A', B', and C' be the vertices of the contact triangle (the triangle with vertices where the incircle touches the sides of ABC). If , , and , then .



The statement of the theorem is in Problem 110. Contact Triangle, Area, Incircle.


"The Contact Triangle and Two Other Subtriangles" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TheContactTriangleAndTwoOtherSubtriangles/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez
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