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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(一〇三
[103]
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一〇三
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幾何原本 卷二
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上、及分餘半線偕引增線上、兩直角方形、幷。</
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<
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線上、兩直角方形、幷。</
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從丁作己丁垂線、引長之。</
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丙丁平行。</
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半直角。</
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庚、亦半直角。</
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<
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亦等。</
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倍大於甲丙上直角方形。</
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直角方形、幷。</
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<
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<
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<
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甲戊、戊庚、上兩直角方形、幷。</
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庚、上兩直角方形、幷。</
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<
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<
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<
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丙、丙丁、上兩直角方形、幷也。</
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<
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<
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<
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與乙丁等故。</
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