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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<
s
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<
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庚戊己角形之庚戊、戊己、兩邊。</
s
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<
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<
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</
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<
s
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<
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xml:space
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<
s
xml:id
="
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xml:space
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">而庚己戊角、與甲丙乙角。</
s
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<
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">宜亦等也。</
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<
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xml:space
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<
s
xml:id
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xml:space
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<
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戊。</
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<
s
xml:id
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xml:space
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">與甲丙乙、兩角等。</
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<
s
xml:id
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<
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xml:space
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">是庚己戊、與丁己戊、亦
<
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等。</
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<
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xml:space
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<
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<
s
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<
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<
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">與
<
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丁戊己角形之戊角、丁己戊角。</
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<
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">各等。</
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">而對丙之甲乙邊、與對己之丁戊邊、又等。
<
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</
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<
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<
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">各等。</
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<
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xml:space
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">而甲角、與戊丁己角、亦等。</
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