Incircle (thing)

Incircle, n.

(Geometry) A circle inscribed within a triangle, i.e., a circle tangent to all three sides of a triangle. Usually mentioned in conjunction with a triangle, such as: "the incircle I of triangle ABC..."

Related words:

• incenter - The center of an incircle, which lies on all three angle bisectors of the triangle.
• circumcircle - Somewhat opposite of an incircle, it is a circle which circumscribes a triangle.