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.

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

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

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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.

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 …

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Two types of geometry are plane geometry and solid geometry. Plane geometry deals with two-dimensional shapes and planes (x-axis and y-axis), while solid geometry deals with three …

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