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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<
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">若所設甲點。</
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">其法尤易。</
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">假如點在丙。</
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<
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">卽以丙為心。</
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<
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">作乙戊圜。</
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<
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">從丙至戊、卽所求。</
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<
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xml:space
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">丁乙戊己庚甲丙</
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number
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48
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<
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xml:space
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>
</
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<
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">求於長線、減去短線之度。</
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<
s
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">乙丙長線。</
s
>
<
s
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">求於乙丙、減甲。</
s
>
<
s
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">先以甲為度。</
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>
<
s
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">從乙引至別界。</
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>
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">作乙丁線。</
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<
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">)</
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<
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">次以乙為心。</
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lb
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界。</
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">作圜。</
s
>
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">(</
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<
s
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">第三求</
s
>
<
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<
s
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">圜界與乙丙、交於戊。</
s
>
<
s
xml:id
="
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">卽乙戊、與等甲之乙丁等。</
s
>
<
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="
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">蓋乙丁、乙戊。</
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>
<
s
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">同心、同圜故。</
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<
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<
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