**THE CRESCENT PUZZLE.— solution**

Referring to the original diagram, let AC be *x*, let CD be
*x* - 9, and let EC be *x* - 5. Then
*x* - 5 is a mean proportional between *x* - 9 and
*x*, from which we find that *x* equals 25. Therefore the diameters
are 50 in. and 41 in. respectively.

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