mathworld.wolfram.com
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MathWorld is Wolfram's comprehensive online math encyclopedia with detailed, illustrated articles on Euclidean geometry topicsātriangles, circles, polygons, theorems, proofs, and related formulas.
More resources on Euclidean Geometry
Art of Problem Solving
Free Euclidean geometry problems and wiki
Euclidean Geometry
Master Euclidean Geometry with AoPS Faculty! This course covers proofs, theorems, and problem-solving techniques.
Geometry
Geometry - A book resource
khanacademy.org
Khan Academy is a free online learning platform with a dedicated Euclidean Geometry course that includes instructional videos, interactive practice problems, and quizzes. It covers topics such as proofs, triangles, circles, congruence and similarity, and other fundamental geometric concepts.
Euclidean and Non-Euclidean Geometries
Euclidean and Non-Euclidean Geometries - A book resource
mathsisfun.com
MathsIsFun.com is a beginner-friendly math resource that explains Euclidean geometry with clear diagrams, definitions, and worked examples, plus practice problems, quizzes, and interactive lessons on shapes, angles, triangles, circles, and other geometric topics.