Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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21
(一)
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(二)
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(三)
26
(四)
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(五)
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(六)
29
(七)
30
(八)
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(七四
[74]
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幾何原本 卷一
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丙己、庚丙壬、兩角形等。</
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<
s
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xml:space
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">而於兩無法四邊形、每減其一。</
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">則所存乙壬庚戊、與庚己丁辛、兩餘方形。
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<
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">求作平行方形。</
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">與所設三角形等。</
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">而方形角、有與所設角等。</
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<
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">法曰。</
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">求於甲線上、作平行方形。</
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">先作丁戊己庚平行方形、
<
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與乙角形等。</
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">作己辛線。</
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">與甲等。</
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>
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">次作辛壬線、與戊己
<
lb
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平行。</
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<
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<
s
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">與辛壬線遇於壬。</
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xml:space
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">次自壬至己、作對角線、引出之。</
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">又自丁庚引長之。</
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<
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">與對
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/>
角線遇於癸。</
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<
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">次自癸作直線與庚辛平行。</
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">又於壬辛引長之。</
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