How to ...
Use GeoGebra 
GeoGebra, developed by Markus Hohenwarter, is a software package which operates across different computer platforms using Java and it is free. It is a very useful piece of software for the mathematics classroom bringing together dynamic geometry, coordinate geometry, algebra and calculus. The coordinate geometry or algebraic component addresses a wider range of topics than the usual dynamic geometry software packages. GeoGebra can be downloaded from www.geogebra.org/download.
What does GeoGebra look like? Click on screenshots.
