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How to Scale a Circle to an Ellipse
An ellipse can be obtained by shortening any diameter of a circle.

This means that you can get an ellipse by flattening a circle. Because one diameter of a circle is compressed, it becomes the short diameter of an ellipse.

Ellipse refers to the locus curve of the moving point P whose sum of distances from the fixed point F 1 and F2 on the plane is equal to a constant. An ellipse is a conic curve, that is, the tangent of a cone to a plane. The circumference of an ellipse is equal to the length of a specific sine curve in a period.