The eight yellow points seem to be situated [br]on the rim of a disc rolling inside the red circle.[br][br]Click on "puzzle" check box to see the unexpected [br]motion each point traces in time.[br][br]Compare this applet with the applet[br]"Disc rolling inside a disc"[br]https://www.geogebra.org/m/2972175[br][br]Why/how do the two applets differ?[br]Why/how are the two applets similar?

Adapted from an applet by Branka Milivojevic