Simplified, mathematics is the study of numbers, patterns, space and change; but this is merely the tip of the spaceship - or the helicopter, the layout of the soccer field for next Saturday's game, the architecture of a new building, or new experiments..

- 182 Geometry Practice SkillsThis is a list of all the skills, organized into categories, learned in geometry. Hover your mouse over any skill name to view, select to practice. IXL keeps track of your score; questions increase in difficulty as you advance. Currently High School level, but good review. Difficulty level is being added to.
- Khan Academy: GeometryHigh-school level course on Geometry, based on Euclid's elements. It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on proving theorems and results from basic postulates.