More cooler things that you can do with geogebra

Heres the link to a really cool thing to do with geogebra and that is to ainimate things with it. Example will be racing cars.
http://www.geogebra.org/en/upload/files/english/David%20Cox/racecar.html

Also, one can also find out radiuses of circles like this:



or make out cool shapes like this too: