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khanacademy.org
https://www.khanacademy.org/math/geometry-home
Geometry (all content) - Khan Academy
Learn geometry—angles, shapes, transformations, proofs, and more.
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wikipedia.org
https://en.wikipedia.org/wiki/Geometry
Geometry - Wikipedia
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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schoolyourself.org
https://schoolyourself.org/learn/geometry
Geometry lessons - School Yourself
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 equal sides, but what about their angles? In triangles, sides and their opposite angles are related! 4. Triangle congruence and similarity.
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geogebra.org
https://www.geogebra.org/geometry
Geometry - GeoGebra
Interactive, free online geometry tool from GeoGebra: create triangles, circles, angles, transformations and much more!
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britannica.com
https://www.britannica.com/science/geometry
Geometry | Definition, History, Basics, Branches, & Facts | Britannica
Geometry, the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space.
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mathsisfun.com
https://www.mathsisfun.com/geometry/
Geometry - Math is Fun
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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cuemath.com
https://www.cuemath.com/geometry-formulas/
2D and 3D Geometry Formulas - Cuemath
Geometry is a part of mathematics that deals with the relationships of points, lines, angles, surfaces, solids measurement, and properties. There are two types of geometry: 2D or plane geometry and 3D or solid geometry.
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examples.com
https://www.examples.com/maths/geometry.html
Geometry - Definition, Types, Formula, Pdf - Examples
Geometry is a branch of mathematics that deals with the study of shapes, sizes, and the properties of space. It focuses on the relationships between points, lines, surfaces, and solids in a way that reveals their nature and interactions.
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math.net
https://www.math.net/geometry
Geometry - Math.net
Geometry is a branch of mathematics that includes the study of shape, size, and other properties of figures. It is one of the oldest branches of mathematics and may have been used even in prehistoric times.
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symbolab.com
https://www.symbolab.com/geometry-calculator
Geometry Calculator - Symbolab
Interactive geometry calculator. Create diagrams, solve triangles, rectangles, parallelograms, rhombus, trapezoid and kite problems.