Excenter

An excenter, denoted , is the center of an excircle of a triangle. An excircle is a circle tangent to the extensions of two sides and the third side. It is also known as an escribed circle.

Properties of the Excenter

• It lies on the angle bisector of the angle opposite to it in the triangle.
• It is the point of concurrency of the angle bisector of the angle opposite to it in the triangle and the angle bisectors of the supplements of the angles which aren't opposite to it.
• In any given triangle, . are the radii of the excircles, and is the inradius.

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