This page uses JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright © 1990-2001 by KCP Technologies, Inc. Licensed only for non-commercial use.

This sketch shows a triangle and its INSCRIBED circle (a circle that is tangent to all 3 sides of the triangle.) Just click any vertext and drag it, and you will see that the circle just "tags along" for the ride. In your geometry class you will disciver how the center of this circle (the incenter), is located. 

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inscribedcircle