What is GeoGebra? Geometry and Algebra combined. Sounds perfect for high school math.
GeoGebra is dynamic mathematics software that joins arithmetic, geometry, algebra and calculus. GeoGebra is an interactive geometry system that allows you to make constructions with points, vectors, segments, lines, conic sections, and functions. But wait, there's more! Equations and coordinates can be entered directly. Thus, GeoGebra has the ability to deal with variables for numbers, vectors and points, finds derivatives and integrals of functions and offers commands like Root or Extremum. In GeoGebra: an expression in the algebra view corresponds to an object in the graphics view and vice versa.