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)
25
(三)
26
(四)
27
(五)
28
(六)
29
(七)
30
(八)
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[43]
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四三
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幾何原本 卷一
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自甲至己、作直線。</
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丙、兩交角又等。</
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亦等矣。</
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<
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<
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丙乙。</
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<
lb
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丙。</
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">作直
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線引長之。</
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<
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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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顯甲辛壬、辛丙乙、兩角形之各邊、各角、俱等。</
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<
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<
lb
/>
矣。</
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<
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N12093
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xml:space
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">夫壬甲辛。</
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<
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<
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">必小於庚甲乙也。</
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<
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等。</
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<
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<
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">其餘乙丙上作外角、俱大於
<
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相對之內角。</
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<
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<
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<
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head
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-1
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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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<
lb
/>
</
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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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