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)
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(六)
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(七)
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(八)
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四五
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幾何原本 卷一
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xlink:href
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乙丙角等矣。</
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何言小也。</
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<
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<
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大於甲乙。</
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<
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<
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<
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甲丁、甲乙、兩腰等。</
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">而甲丁乙、甲乙丁、兩角亦等。</
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丁角。</
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<
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甲丁、甲乙、兩線。</
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<
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</
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<
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所作角。</
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<
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<
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<
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<
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