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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庚己甲乙戊丙</
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<
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s
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s
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一邊為兩平分。</
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<
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<
s
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<
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<
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<
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">次
<
lb
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自甲作直線、與乙丙平行。</
s
>
<
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<
s
xml:id
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xml:space
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">本篇卅一</
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>
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<
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">而與戊己線遇於己。</
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>
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">末自丙作直線、與戊己
<
lb
/>
平行、為丙庚。</
s
>
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>
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s
>
<
s
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">而與甲己線遇於庚。</
s
>
<
s
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xml:space
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">則得己戊丙庚平行方形、與甲乙丙
<
lb
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角形等。</
s
>
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