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[" If "d(1),d(2)(d(2)>d(1))" be the diam...

[" If "d_(1),d_(2)(d_(2)>d_(1))" be the diameters of two concentric circles and "c" be the length of a chord "],[" of a circle which is tangent to the other circle,prove that "d_(2)^(2)=c^(2)+d_(1)^(2)" ."]

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