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The Concept of "Five centroids of triangle etc."

There are five centroids of triangle, that is ; Circumcenter, Incenter, Barycenter, Orthocenter, Excenter.
Although these contents are for high school mathematics in many cases, figures related to center points are very interesting geometrically in many senses.
Moreover, there are various other points which are the intersections of three lines. We see them in this section.

Forum of Geometric Constructor by Y.Iijima