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 below
to start the step-by-step illustration.
Reference: Evelyn, C. J. A., Money-Coutts, G. B. &
Tyrrell, J. A. (1974), The Seven Circles Theorem and other New Theorems, Stacey