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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<
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<
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xml:space
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">其所作戊甲丁、與甲丁乙、相對之兩內角等。</
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<
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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s
>
<
s
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xml:space
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<
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<
s
xml:id
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N12A6C
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xml:space
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">增從此題、生一用法。</
s
>
<
s
xml:id
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N12A6F
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xml:space
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">設一角。</
s
>
<
s
xml:id
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N12A72
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">兩線。</
s
>
<
s
xml:id
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N12A75
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">求作有法四邊形。</
s
>
<
s
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">有角與所設角等。</
s
>
<
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">兩兩邊線、與所設線等。</
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<
p
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<
s
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">法曰。</
s
>
<
s
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">先作己丁戊角、與丙等。</
s
>
<
s
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xml:space
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">次截丁戊線。</
s
>
<
s
xml:id
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"
xml:space
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">與甲等。</
s
>
<
s
xml:id
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">己丁線。</
s
>
<
s
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xml:space
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">與乙等。</
s
>
<
s
xml:id
="
N12A91
"
xml:space
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">末依丁戊平行、作己庚。</
s
>
<
s
xml:id
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"
xml:space
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">依己丁平行、
<
lb
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作庚戊。</
s
>
<
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">卽所求。</
s
>
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">丙
<
lb
/>
甲
<
lb
/>
乙
<
lb
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庚己丁戊</
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>
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>
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