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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 .


	Contributed by: Jay Warendorff After work by: Antonio Gutierrez

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

Contact Triangle (Wolfram MathWorld)

Incircle (Wolfram MathWorld)

"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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