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Javascript Version

4 Point Circle

This triangle contains four different special points, defined by the triangle. These points are: intersection of angular bisectors (red lines, point H), intersection of altitudes (purple lines, point K), intersection of perpendicular bisectors (green lines, point F), and intersection of the lines joining verticies with the midpoints opposite them (blue lines, point G)

 

 

 

 

 

 

 

 

 

 

 

 

 

Three of the four points are always collinear. Is the other point ever collinear? If so, in what cases is it collinear?

If you are interested in this applet, you may like our Interactive Symbolic Geometry software Geometry Expressions.