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

 
Resource Type
Activity
Tags
conic  ellipse  foci  folding 
Target Group (Age)
13 – 18
Language
English
 
 
License
CC-BY-SA, GeoGebra Terms of Use
Derived Resources
Folding Ellipse
Shared by Audrey Nasar
 
 
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