Geometry Revisited
H.S.M. Coxeter, Samuel L. Greitzer
Geometry Revisited - A book resource
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More resources on Circles
Brilliant.org Circles
Interactive problems on circles, free trial rec'd
Introduction to Geometry
Master circles! Learn key geometry concepts with our Introduction to Geometry course taught by AoPS Instructors.
Geometry: Circles
Master circles! Learn about circumference, area, theorems, and more with this comprehensive geometry course by Sal Khan.
khanacademy.org
Khan Academy is a nonprofit online learning platform offering free video lessons, practice problems, and quizzes across math and other subjects. For circles, it provides geometry modules with concept explanations, circle properties and theorems, and lots of practice problems with step-by-step tutorials.
mathsisfun.com
Mathisfun.com is an approachable math-learning site offering clear explanations, diagrams, and practice across topics, including a Circle section with radius, diameter, circumference, area, and related formulas.
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia by Wolfram, offering in-depth articles, definitions, formulas, and diagrams on topics across math, including circles. It provides explanations and references to help learners explore mathematical concepts.