Ellipse by Paper Folding
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Let be the center of a circle with radius
and let
be a point inside the circle. Choose a point
on the circumference. Let
be the intersection of the perpendicular bisector of
and line
. Then
. So the point
is on the ellipse with foci
and
and the sum of the distances from
to the foci is
.
Contributed by: Izidor Hafner (March 2019)
Using code by: Borut Levart
Open content licensed under CC BY-NC-SA
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