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Euclid: Elementa

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Euclid: Elementa
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If three straight lines be proportional, the rectangle contained by the extremes is equal to the square on the mean; and, if the rectangle contained by the extremes be equal to the square on the mean, the three straight lines will be proportional.
lat Clavius
No Latin
kin 幾何原本 p. 308
三直線為連比例。卽首尾兩線、矩內直角形。與中線上直角方形、等。首尾線矩內直角形、與中線上直角方形、等。卽三線為連比例。
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