The Nine-point Circle
- Irina Boyadzhiev
Given is any triangle ABC. (Drag points A, B or C to change it).
- MAB, MBC and MAD (in red) are the midpoints of the sides of the triangle .
- HA, HB and HC(in green) are the feet of the altitudes of the triangle.
- K, L and M (in orange) are the midpoints of the three segments from the orthocenter to the vertices.