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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xlink:href
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http://libcoll.mpiwg-berlin.mpg.de/libview?url=/mpiwg/online/permanent/library/02NT95YF/pageimg&mode=imagepath&pn=55
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得丙丁直線。</
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<
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<
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<
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xml:space
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">而丙丁同線。</
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<
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">甲丙丁、與乙丙丁、兩角又等。</
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<
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甲丁、與乙丁、兩線必等。</
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<
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">用法。</
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">以甲為心。</
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">任用一度。</
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">但須長於甲乙線之半。</
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線。</
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甲乙於戊。</
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<
head
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head
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<
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<
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">先於丙左、右。</
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<
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丁戊為底作兩邊等角形。</
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<
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">為丁己戊。</
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<
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">末自己至丙作直線。</
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<
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">卽己丙為甲乙之垂線。</
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