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Circle Definition & Meaning - Merriam-Webster
Circle - Wikipedia
What is a Circle? Definition, Formulas, Properties, Examples
CIRCLE Definition & Meaning | Dictionary.com
CIRCLE | definition in the Cambridge English Dictionary
Circles - Formulas, Properties | What is a Circle? | Examples
CIRCLE | English meaning - Cambridge Dictionary
Circles | Geometry (all content) | Math | Khan Academy
Circle - Math is Fun
Circles | Brilliant Math & Science Wiki