THE CRESCENT PUZZLE

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?

几何学 -> 平面几何学 -> 圆代数学 -> 方程

来源：

Amusements in Mathematics, Henry Ernest Dudeney 问题 191

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