Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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(四〇
[40]
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四〇
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幾何原本 卷一
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丁丙、與丙戊、是一直線。</
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">或離戊而上、為丁丙己。</
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也。</
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">為甲丙己、甲丙丁兩角。</
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">此兩角宜與兩直角等。</
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<
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甲丙戊、甲丙丁、兩角、與甲丙己、甲丙丁。</
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丙戊、與甲丙己、兩角較之。</
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分。</
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<
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">則甲丙線、至丁丙庚直線上。
<
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</
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">為甲丙庚、甲丙丁、兩角。</
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<
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">此兩角、宜與兩直角等。</
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<
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兩角、與甲丙戊、甲丙丁、兩角亦等矣。</
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較之。</
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