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Euclid: Elementa

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Euclid: Elementa
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[Porism. From this it is manifest that, if two straight lines cut one another, they will make the angles at the point of section equal to four right angles.]
lat Clavius
No Latin
kin 幾何原本 p. 42
一系。推顯兩直線相交。於中點上作四角。與四直角等。
二系一點之上。兩直線相交不論幾許線、幾許角。定與四直角等。公論　\\　十八。
增題一直線內、出不同方兩直線、而所作兩交角等。卽後出兩線、為一直線。
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