# The Extouch and Intouch Triangles of a Triangle

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A circle drawn outside a triangle that is tangent to the extensions of two of its sides and to the third side is an excircle.

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Contributed by: Jay Warendorff (March 2017)

After work by: Antonio Gutierrez

Open content licensed under CC BY-NC-SA

## Details

The statement of the theorem is in Problem 86. Intouch and Extouch Triangles, Area.

## Snapshots

## Permanent Citation