Hypotrochoid vs. Epitrochoid

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Difference Between Hypotrochoid and Epitrochoid
Hypotrochoidnoun
(geometry) A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle.
Epitrochoidnoun
A geometric curve traced by a fixed point on one circle which rotates around the perimeter of another circle. Examples include the shape of the Wankel engine