191.--THE CRESCENT PUZZLE.

From Amusements in Mathematics by Henry Ernest Dudeney.

[Illustration]

Here is an easy geometrical puzzle. The crescent is formed by two circles, and C is the centre of the larger circle. The width of the crescent between B and D is 9 inches, and between E and F 5 inches. What are the diameters of the two circles?

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191.--THE CRESCENT PUZZLE.: Amusements in Mathematics by Henry Ernest Dudeney | amphi