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Poncelet's Porism - Numberphile

2020-09-19

[public] 213K views, 8.23K likes, 623 dislikes audio only

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draw the tangent line
/youtube/video/n5bw-Y13pdY?t=44.379002
identify this with the set of points c and d
/youtube/video/n5bw-Y13pdY?t=291.89899
draw two ellipses
/youtube/video/n5bw-Y13pdY?t=314.85901