Nine Point Circle
JavaSketchpad DR1 Demo
In any triangle, one can locate a circle that passes through the midpoints of that triangle's edges, the midpoints of its perpendicular segments, and the feet of a given triangle's perpendiculars. In this JavaSketch, drag the vertices of the yellow triangle to alter the triangle.
This is a demonstration of the capabilities of the first version of JavaSketchpad, DR1. More recent versions added many basic capabilities (such as labels) that are not demonstrated by this applet.