The sum of lengths of two segments (CA and AB') joining a point (A) on an ellipse to its foci is constant (radius of the circle here). The locus of all A s will thus form an ellipse will C and B' as it's foci.pic.twitter.com/1840277O9Q
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The sum of lengths of two segments (CA and AB') joining a point (A) on an ellipse to its foci is constant (radius of the circle here). The locus of all A s will thus form an ellipse will C and B' as it's foci.pic.twitter.com/1840277O9Q
Nice. Wonder if other objects (rectangle, triangle, etc) have similar/comparable properties.
With a square of paper you can form a parabola...
Someone really bored in class discovered this
It's really worthwhile doing this kind of thing for real:pic.twitter.com/fWHUM1966Y
let me just casually cut out a perfect circle and perform hundreds of folds
you don't have to cut it though, just draw a perfect circle. And in case you forget..pic.twitter.com/eTmejnnUkr
To make an ellipse: Step 1. Make another ellipse with coincident foci. Hmm...
1) Cut an ellipse from a regular piece of paper
You can draw a circle with almost anything...
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