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to a seventh circle and each tangent to its two neighbors, the three
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Michael Borcherds showing The Seven Circles Theorem made using
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Evelyn, C. J. A.; Money-Coutts, G. B.; Tyrrell, J. A. (1974).
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Stanley Rabinowitz, with a proof based on Ceva's theorems.
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The
Penguin Dictionary of Curious and Interesting Geometry
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Cundy, H. Martyn (1978). "The seven-circles theorem".
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65:Brianchon's theorem
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