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.

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

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

Feb 27, 2026 · Geometry, the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space.

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

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!

Apr 2, 2026 · GoGeometry.com offers free educational resources and over 1600 illustrated problems to help geometry students practice and learn.

Geometry (from the Ancient Greek: geo- "earth", -metron "measurement") is a branch of mathematics, that is primarily concerned with the shapes and sizes of the objects, their relative position, and the …

Learn Geometry skills for free! Choose from hundreds of topics including transformations, congruence, similarity, proofs, trigonometry, and more. Start now!