Folding Ellipse

Inspired by an animation from mathani: [url]http://mathani.tumblr.com/post/82979891665/get-you-best-paper-cut-a-circle-and-fold-it-so[/url] Mathani says: "Get your best paper, cut a circle and fold it so that the circumference falls on a fixed point inside. Repeat, using random folds. Now see the creases. This is how you paper-fold an ellipse." Now there's lots of questions. Is it really an ellipse? Where are the foci? How would you find them from the circle and the point? Are the folds tangent lines? What do you wonder?

 

John Golden

 
Kaynak Türü
Etkinlik
Etiketler
conic  ellipse  foci  folding 
Hedef Grup (Yaş)
13 – 18
Dil
English
 
 
Lisans
CC-BY-SA, GeoGebra Terms of Use
Türetilmiş Kaynaklar
Folding Ellipse
Paylaşan - Audrey Nasar
 
 
© 2025 International GeoGebra Institute