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Seven Circles  Theorem. Variants 1, 2, and 3. Step-by-step illustration. Level: High School, College.

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Seven Circles Theorem

Draw a circle and arrange six circles tangent to it such that they touch both the original circle and their two neighbors. Then the three lines joining opposite points of tangency concur. Click the Next button above to start the step-by-step illustration. See also: Seven Circles theorem: Typography in motion.

Reference: Evelyn, C. J. A., Money-Coutts, G. B. & Tyrrell, J. A. (1974), The Seven Circles Theorem and other New Theorems, Stacey International, London

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