????? ( ?????? ) ???? ??? ????? ???? . ??? ???? ?????????, ?????? ???? ?????????? ???? ????????? ??????????? ????????? ??????????? ???? ??????? ????; ???? ?????????, ???? ????????? ??????????? ???? ????????? ?????? ???????? ???????? ??? ????????????, ?????? ?????????? ??????????????. ?????? ???????? ????? ??????? ?????? ???????? ??????? ???? ?????????????.

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• Hazewinkel, Michiel, ed. (2001) [1994], "Circle", Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
• Circle (PlanetMath.org website)
• Weisstein, Eric W. "Circle". MathWorld.
• Interactive Java applets for the properties of and elementary constructions involving circles.
• Interactive Standard Form Equation of Circle Click and drag points to see standard form equation in action
• Munching on Circles at cut-the-knot