(or should I have titled this Toroidal Helix?)[br][br]After learning how a unit circle on the 2D x-y plane may be parameterized as (x,y)=(cos(t), sin(t)), extend the shape into 3D.[br][br]What if the radius R of this circle varied sinusoidally along the path orbiting the origin?[br]→ Drag slider r to nonzero values[br]→ Drag slider N to different values[br][br]What if the curve rises out of the 2D x-y plane sinusoidally to create a 3D shape?[br]→ Drag slider "make3D" to nonzero values [br][br]In addition to using pre-set "view" buttons, click/drag or use touchscreen gestures to adjust 3D viewing perspective.

Also check out [url=https://www.geogebra.org/m/tkxcbedc]Helix[/url].