Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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31
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(一〇)
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(一一四
[114]
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一一四
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幾何原本 卷三之首
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垂線為度。</
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<
s
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<
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<
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xml:space
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<
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甲戊、甲己、諸線。</
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<
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<
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">其去戊心遠近等。
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</
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<
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xml:id
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xml:space
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">為己戊、庚戊、兩垂線等故。</
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>
<
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xml:id
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xml:space
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">若辛壬線。</
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<
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<
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">為戊癸垂線小故。</
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variables
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-1
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<
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<
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">甲乙丙丁圜之乙丁直線。</
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<
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">任割圜之一分。</
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>
<
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xml:id
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xml:space
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">如甲乙丁、及乙丙丁、兩形。</
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>
<
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xml:id
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">皆為圜分。</
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>
<
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">凡分有三形。</
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>
<
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">其過心者、
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為半圜分。</
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>
<
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">函心者、為圜大分。</
s
>
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">不函心者、為圜小分。</
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>
<
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xml:id
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preserve
">又割圜之直線、為絃。</
s
>
<
s
xml:id
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N14AAF
"
xml:space
="
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">所割圜界之一分、為弧。</
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>
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