Learn geometry—angles, shapes, transformations, proofs, and more.

Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a geometer.

Official Geometry Dash website by RobTop Games. Play the browser demo, view top player leaderboards, and get the game.

Interactive, free online geometry tool from GeoGebra: create triangles, circles, angles, transformations and much more!

Essential stuff for describing the world around you. 1. Lines and angles. 2. Related angles. What about angles bigger than 360 degrees? 3. Triangles. See if it's really true, and then prove it! They have two …

Geometry is all about shapes and their properties. If you like playing with objects, or like drawing, then geometry is for you!

4 days ago · Geometry, the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space.

Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more (aligned with Common Core standards).

Geometry Lessons and Practice is a free site for students (and teachers) studying geometry in high school.