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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">與甲丙、乙己、平行。</
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<
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s
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xml:space
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乙己丁辛、兩平行方形旣等。</
s
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<
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<
s
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xml:space
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">則甲丙戊、與乙己丁、兩角形、為兩方形之
<
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半者、</
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<
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">任於一邊、兩平分之。</
s
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<
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">向對角作直線。</
s
>
<
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">卽分本形為兩平分。</
s
>
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">論曰。</
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<
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">甲乙丙角形。</
s
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<
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">試以乙丙邊、兩平分於丁。</
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<
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<
s
xml:id
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">卽甲丁
<
lb
/>
線、分本形為兩平分。</
s
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<
s
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xml:space
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">何者。</
s
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<
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">試於甲角上作直線。</
s
>
<
s
xml:id
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">與乙丙平行。</
s
>
<
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<
s
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<
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">)</
s
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<
s
xml:id
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xml:space
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">則甲乙丁、甲丁丙、兩角形、在兩平行
<
lb
/>
線內。</
s
>
<
s
xml:id
="
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xml:space
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">兩底等。</
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">兩形亦等。</
s
>
<
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<
s
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<
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<
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<
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<
s
xml:id
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xml:space
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">求從點分本形、為兩平分。</
s
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</
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<
p
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<
s
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">法曰。</
s
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<
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">甲乙丙角形。</
s
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<
s
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">從丁點求兩平分。</
s
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<
s
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<
s
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">次平
<
lb
/>
分乙丙線於戊。</
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<
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<
s
xml:id
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<
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<
s
xml:id
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s
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<
s
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s
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<
s
xml:id
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<
s
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<
s
xml:id
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<
s
xml:id
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<
lb
/>
為兩平分。</
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</
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<
p
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<
s
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<
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xml:id
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">試作甲戊直線。</
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<
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<
lb
/>
等。</
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<
s
xml:id
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">而每加一己戊丙形。</
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<
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<
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<
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<
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<
s
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<
lb
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甲乙丙之半。</
s
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<
s
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<
s
xml:id
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<
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<
s
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</
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