# A Triangle and an External Contact Triangle

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Extend two sides of a triangle and construct the circle tangent to those sides and the third side of the triangle. The resulting circle is called an excircle. The triangle formed by the three points of tangency is called an external contact triangle.

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Contributed by: Jay Warendorff (March 2011)

After work by: Antonio Gutierrez

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

The statement of the theorem is in Problem 83. Area of an Excircle Contact Triangle, Exradius, Circumradius.

## Permanent Citation

"A Triangle and an External Contact Triangle"

http://demonstrations.wolfram.com/ATriangleAndAnExternalContactTriangle/

Wolfram Demonstrations Project

Published: March 7 2011