Roulette (Spirograph) Curves

Animated Hypotrochoid

Small circle (or gear) travels around the inside of larger circle (or gear).

Animated Epitrochoid

Small circle (or gear) travels around the outside of larger circle (or gear).

Animated Hypo/Epitrochoid

Both types of curves drawn at the same time.

Hypotrochoid
(Print and Color!)

Plot a single, or multiple, hypotrochoid curve(s) to print and color on paper, or save and color on a mobile device.