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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四四
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幾何原本 卷一
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xlink:href
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丙矣。</
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<
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">凡三角形。</
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<
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">解曰。</
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">大於甲乙邊、乙丙邊。</
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甲角、乙甲丙角。</
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>
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<
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<
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">甲丙邊、大於甲乙邊。</
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">卽於甲丙線上、截甲丁。</
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<
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">與甲乙等。</
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<
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<
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">則甲乙丁、與甲丁乙、兩角等矣。</
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<
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<
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">乙丙丁角形之外角。</
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">必大於相對之丁丙乙內角。</
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<
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<
s
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<
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">而況甲乙丙、又函甲乙丁於其中。</
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">如乙丙邊、大於甲乙邊。</
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<
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xml:space
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">則乙甲丙角、亦大於甲丙乙角。</
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<
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<
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-1
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<
s
xml:id
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">凡三角形。</
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<
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<
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<
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<
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<
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<
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<
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/>
之甲乙邊。</
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</
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<
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<
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<
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<
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<
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<
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