Saturday, January 21, 2012


hypotrochoid is a curve traced out by a point "attached" to a smaller circle rolling around inside a fixed larger circle. In this example, the hypotrochoid is the red curve that is traced out by the red point 5 units from the center of the black circle of radius 3 as it rolls around inside the blue circle of radius 5. Both hypotrochoids and epitrochoids can be created using the Spirograph drawing toy.

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