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.

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Geometry Dash Lite: This game is a free and incomplete version of Geometry Dash with 15 levels. Players can still fully experience the difficulty from Easy to Demon with the same map design as the …

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 …

Feb 3, 2026 · Geometry, the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space.

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