Fold a circle to see an ellipse
- Auteur :
- Vincent Pantaloni
- Thème :
- Ellipse
Starting with a circular sheet of paper and a point P marked on the inside. Fold the paper so that the circumference touches P. Repeat. The lines marked by the creases form an ellipse.
See this video for a real paper animation and a proof:
https://youtu.be/pSTa8a36RCU