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Euclid: Elementa

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gre V,0
ι᾽ Ὅταν δὲ τέσσαρα μεγέθη ἀνάλογον ᾖ, τὸ πρῶτον πρὸς τὸ τέταρτον τριπλασίονα λόγον ἔχειν λέγεται ἤπερ πρὸς τὸ δεύτερον, καὶ ἀεὶ ἑξῆς ὁμοίως, ὡς ἂν ἡ ἀναλογία ὑπάρχῃ.
eng
10. When four magnitudes are proportional, the first is said to have to the fourth the triplicate ratio of that which it has to the second, and so on continually, whatever be the proportion.
lat Sic
Quando autem quattuor quantitates proportionales fuerint, prima ad quartam triplicem proportionem habere dicitur quam ad secundam et semper deinceps uno plures prout utique proportionalitas fuerit.
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lat Hermann
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ara Uppsala
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ara Tuṣi
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ara Nairizi
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san
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lat Clavius
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kin 幾何原本 p. 223-224
四幾何。為同理之連比例。則第一與四。為三加之比例。倣此以至無窮。
甲、乙、丙、丁、戊、五幾何。為同理之連比例。其甲與乙。若乙與丙。乙與丙。若丙與丁。丙與丁。若丁與戊。卽一甲與三丙。視一甲與二乙。為再加之比例。又一甲與四丁。視一甲與二乙。為三加之比例。何者。甲、丁、之中。有乙、丙、兩幾何。為同理之比例、如甲與乙。故也。又一甲與五戊。視一甲與二乙。為四加之比例也。若反用之。以戊為首。則一戊與三丙為再加。與四乙為三加。與五甲為四加也。
下第六卷二十題。言此直角方形、與彼直角方形。為此形之一邊。與彼形之一邊再加之比例。何者。(p. 二二四)若作三幾何、為同理之連比例。則此直角方形、與彼直角方形。若第一幾何、與第三幾何。故也。以數明之。如此直角方形之邊、三尺。而彼直角方形之邊、一尺。卽此形邊、與彼形邊。若九、與一也夫九與一之間。有三。為同理之比例。則九、三、一、三幾何之連比例。旣有三與一、為比例。又以九比三。三比一。為再加之比例也。則彼直角方形。當為此形九分之一。不止為此形三分之一也。大略第一與二之比例。若線相比。第一與三。若平面相比。第一與四。若體相比也。第一與五。若算家三乘方。與六。若四乘 \\ 方。與七。若五乘方。倣此以至無窮。
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