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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行。</
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xml:space
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<
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<
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<
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同方相對之庚辛丙內角、等。</
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<
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<
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xml:space
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lb
/>
亦等。</
s
>
<
s
xml:id
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xml:space
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s
>
<
s
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xml:space
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<
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s
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<
s
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s
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<
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">後解曰。</
s
>
<
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xml:space
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<
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xml:id
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xml:space
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">與兩直角等
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題言甲乙、丙丁、兩線必平行。</
s
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</
p
>
<
p
xml:id
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<
s
xml:id
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<
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<
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xml:space
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">而甲庚戊、甲庚辛、兩角、亦與兩直
<
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角等。</
s
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<
s
xml:id
="
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xml:space
="
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s
>
<
s
xml:id
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xml:space
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">本篇十三</
s
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xml:space
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s
>
<
s
xml:id
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xml:space
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>
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s
xml:id
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<
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xml:id
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xml:space
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<
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/>
同方相對之內角等。</
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<
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xml:id
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xml:space
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<
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xml:space
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<
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<
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<
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<
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直角等。</
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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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<
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辛庚、內相對兩角必等。</
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