A circular plate rolls inside a rectangular tray making five
circuits and rotating about its centre seven times. Find the
dimensions of the tray.
Consider the mechanics of pole vaulting
You might look for a cyclic quadrilateral.
We have constructed this in geogebra to help
Created with GeoGebra
You might like to download your own free copy of GeoGebra from the link above and draw this dynamic diagram for yourself. You will find it easy to get started on GeoGebra with the Quickstart guide for beginners.