|-----handy-ruler------------------------------------------------------| geogebra: geogebra (free software for teaching mathematics) geogebra: geogebra: GeoGebra is a free interactive geometry, algebra, statistics and geogebra: calculus software. geogebra: geogebra: geogebra: geogebra: geogebra: geogebra: geogebra: Package created by Niki Kovacs