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)
30
(八)
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(三五
[35]
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三五
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幾何原本 卷一
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<
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<
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">于丙點左、右。</
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<
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<
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<
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s
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<
s
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xml:space
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">但須長於丙丁線。</
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<
s
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xml:space
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<
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xml:space
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<
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用元度。</
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<
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<
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<
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variables
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<
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">以丁為心。</
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>
<
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">於丙上、下方、各作短界線。</
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<
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">次用元度。</
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>
<
s
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xml:space
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<
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為心。</
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<
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<
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<
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">視直線交於丙點、卽得。</
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<
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xml:space
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">是用法、又為當巧之法。</
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<
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">若甲乙線所欲立垂線之點乃在線末甲界上。</
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">甲外無餘線可截。</
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">則於甲乙線上。</
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>
<
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">任取一點為丙。</
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xml:id
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xml:space
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">如
<
lb
/>
前法、於丙上立丁丙垂線。</
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<
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xml:id
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xml:space
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">次以甲丙丁角。</
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<
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<
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<
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xml:id
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<
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<
s
xml:id
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">為己丙線。</
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>
<
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xml:id
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xml:space
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">次以甲丙為度。</
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>
<
s
xml:id
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xml:space
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">於丁丙垂線上、截
<
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/>
戊丙線。</
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<
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<
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<
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">次於戊上、如前法、立垂線。</
s
>
<
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">與己丙線相遇、為庚。</
s
>
<
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<
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