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© Copyright 2003, Jim Loy
This is the same method as Ellipse #6, and shows that an entire family of ellipses can be drawn with a spirograph. Notice that the endpoints of the line move in straight lines, and the midpoint moves in a circle. The outer boundary of this family of ellipses is called an Astroid.
The above Java animation was created with Cinderella (a geometry program).
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