Circumcircle and orthocenter
Let P be a point on the circumcircle of triangle ; also let be reflections of P over sides , respectively. Then are all collinear with the orthocenter of the triangle.
- Points A,B,C are free objects defining triangle ABC & (therefore) the circumcircle.
- P animates around circle.
- Orthocenter is point of intersection for all three altitudes of triangle ABC.