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Euclid: Elementa

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Euclid: Elementa
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2. [When two sides of one figure together with two sides of another figure form antecedents and consequents in a proportion, the figures are reciprocally related.
lat Clavius
No Latin
kin 幾何原本 p. 278
第二界
兩形之各兩邊線。互為前後率。相與為比例而等。為互相視之形。
甲乙丙丁、戊己庚辛、兩方形。其甲乙、乙丙、邊。與戊己、己庚、邊。相與為比例等。而彼此互為前、後。如甲乙與。戊己。若己庚與乙丙也。則此兩形為互相視之形。依顯壬癸子、丑寅卯、兩角形之壬子與丑寅。若丑卯與壬癸。或壬癸與丑寅。若丑卯與壬子。亦互相視之形也。
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