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)
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(四)
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(五)
28
(六)
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(七)
30
(八)
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幾何原本 卷一
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底之外兩角。</
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丁角。</
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丁丙、亦小於戊丙丁矣。</
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知。</
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丁在甲丙元線外。</
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如上第一說駁之。</
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言丁在丙外而後出二線。</
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相交。</
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甲丙丁、宜與甲丁丙、兩角等也。</
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三角形。</
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丙丁角。</
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