Interoperable interactive geometry for Europe
I forgot my login data

Report a bug

Fan club

Quick Intro Videos
click to start movie
Create A Simple
GeoGebra Resource (25Mb)
click to start movie
Filing a review
click to start movie
Find a Resource

This platform is brought to you by the intergeo project, funded under the eContent Plus programme of the European commission and by partners

Spirograph (Epitrochoids and Hypotrochoids!)

This applet shows a curve formed by rolling a circle inside or outside of another circle. Like the child's toy of the same name, it allows exploration and makes pretty pictures. It was created by Marc Renault of the Mathematics Department, Shippensburg University.

Open or Download This File:


Preview of the Resource in Action