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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二一
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幾何原本 卷一
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<
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<
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圜。</
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<
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">以甲為心。</
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">其甲乙線。</
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">與甲丙、甲丁、線等。</
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">以乙為心。</
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">與乙丙、乙丁、線亦等。</
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">凡為圜。</
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">自心至界。</
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">各線俱等故。</
s
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<
s
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<
s
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">而甲而甲丙亦等於甲乙。</
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