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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<
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<
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辛矣。</
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s
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為論者。</
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乙丙、兩角等。</
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戊與丙乙丁、兩外角、亦等。</
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</
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<
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<
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三角形必等。</
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<
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<
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<
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