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 卷一之首
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<
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xml:space
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<
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xml:space
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">而甲乙為垂線。</
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<
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xml:space
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<
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<
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">丙乙與甲乙相遇。</
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<
lb
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線若垂下過乙。</
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<
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">所以丙乙亦為甲乙之垂線。</
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相為直線。</
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<
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<
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<
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