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wolfram "On the Equations and Properties: 1 of the System of Circles Touching Three Circles in a Plane; 2 of the System of Spheres Touching Four Spheres in Space; 3 of the System of Circles Touching Three Circles on a Sphere; 4 of the System of Conics Inscribed to a Conic, and Touching Three Inscribed Conics in a Plane"
2004 Harkness, James 1898

5 4 : 8—12.

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مساحة الدائرة worksheet
Martin Celli, "A Proof of the Butterfly Theorem Using the Similarity Factor of the Two Wings", 16, 2016, 337—338
قانون مساحة ومحيط الدائرة
doi:10
مساحة ومحيط الدائرة
New York: McGraw-Hill
mathworld 1 1
Weisstein, Eric W 1959

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