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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幾何原本 卷一
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而乙丁與甲丙等。</
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<
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乙丙全形與丁乙丙分形同也。</
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<
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之乙丁、與甲乙丙兩形之甲丙、兩線旣等。</
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<
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之乙丙、又同線。</
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">而元設丁乙丙、與甲丙乙、兩角等。</
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等也。</
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">是全與其分等也。</
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">故底線兩端之兩角等者。</
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丙等。</
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