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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乙、與甲丙、兩腰又等。</
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<
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<
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相當之各兩角。</
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亦等。</
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<
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己、甲丁、兩腰。</
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<
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<
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<
lb
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腰又等。</
s
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<
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xml:space
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<
s
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<
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xml:space
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<
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<
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<
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">又乙丙同腰。</
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<
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丙丁、與丙乙己、兩角亦等也。</
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xml:space
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">則丙之外、乙丙己角、與乙之外、
<
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丙乙丁角、必等矣。</
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<
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<
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<
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">於
<
lb
/>
甲乙己、減丙乙己角。</
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xml:space
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">則所存甲丙乙、與甲乙丙、兩角必等。</
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<
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<
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<
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