Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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幾何原本 卷一之首
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http://libcoll.mpiwg-berlin.mpg.de/libview?url=/mpiwg/online/permanent/library/02NT95YF/pageimg&mode=imagepath&pn=29
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<
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xml:id
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xml:space
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">甲乙丙丁</
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<
p
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<
s
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<
s
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xml:space
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">一說。</
s
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<
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">圜是一形。</
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<
s
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xml:space
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">復於元處所作。</
s
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<
s
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">如上圖甲丁線轉至乙丁。</
s
>
<
s
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xml:space
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">乙丁
<
lb
/>
轉至丙丁。</
s
>
<
s
xml:id
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xml:space
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">丙丁又至甲丁。</
s
>
<
s
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xml:space
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">復元處其中形卽成圜。</
s
>
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-1
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<
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">圜之中處。</
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<
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">為圜心。</
s
>
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16
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<
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">戊甲丁乙丙</
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>
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<
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head
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indent
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-1
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xml:id
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<
s
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">過中心至他界。</
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">為圜徑。</
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">徑分圜兩平分。</
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<
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">自甲至乙、過丙心、作一直線。</
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">為圜徑。</
s
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type-free
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<
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head
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="
-1
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xml:id
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<
s
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">徑線與半圜之界所作形。</
s
>
<
s
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">為半圜。</
s
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-1
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<
s
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">在直線界中之形。</
s
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<
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s
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-1
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head
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