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 List of Puzzles List of Solutions Solution to Puzzle 73.  SEVEN CIRCLES The formula for the circumference of a circle is &pi * D, where D is the diameter of the circle.  Let D1, D2, D3, D4, D5, D6 and D7 be the diameters of the seven circles.  Then, the sum of circumferences of the seven circles would be π * (D1 + D2 + D3 + D4 + D5 + D6 + D7). Since D1 + D2 + D3 + D4 + D5 + D6 + D7 = 60 cm. The sum of circumferences of the seven circles is (π * 60) cm. or around 188.5 cm. Support this site

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 The Last Recreations:  Hydras, Eggs, and Other Mathematical Mystifications Author:  Martin Gardner

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