Geogebra

I have recently abandoned The Geometers' Sketchpad, in favour of the free, regularly updated and feature rich GeoGebra. I had always found GSP clumsy in the way that you had to do things (maybe I was just getting used to it). GeoGebra seems more intuitive. The cartesion plane does not seem as though it is an after thought either, with good capabilities. I have started to create a number of GeoGebra applets. Here are the first three:

• Area of a triangle (proof)


• Area of a circle, by using inscribed polygons


• Angle sum of a triangle

Feel free to download them and use under the creative commons (AT-NC-SA) license.