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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等。</
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<
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/>
丙、等。</
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<
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">而戊丙丁、與甲乙丙、又等。</
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<
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">則甲丙丁外角、與內兩角甲、乙、幷、等矣。</
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>
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">後解曰。</
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<
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>
<
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>
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xml:space
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">則甲丙丁、甲丙乙、兩角幷、與甲、乙、丙、內三
<
lb
/>
角幷、等矣。</
s
>
<
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">元與兩直角等。</
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<
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<
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">亦與兩直角等。</
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