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If d(1), d(2) (d(2) gt d(1)) be the diam...

If `d_(1), d_(2) (d_(2) gt d_(1))` be the diameter of the two cocentric 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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