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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">至直線上。</
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<
s
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<
s
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s
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">先以丙為心。</
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<
s
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s
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">為丁為戊。</
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<
s
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<
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/>
丁戊、各作直線至丙。</
s
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<
s
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">)</
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<
s
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s
>
</
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<
s
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">論曰、丙己丁、丙己戊、兩角形之丙丁、丙戊、兩線等。</
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<
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">則丙戊己、與丙丁己、兩角必等。</
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>
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<
s
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<
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丙己、與戊丙己兩角又等。</
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xml:space
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">則丙己丁、與丙己戊、等皆直角。</
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>
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<
s
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">而丙己定為垂線矣。</
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>
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<
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<
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">以丙為心。</
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<
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">向直線兩處、各作短界線。</
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">為甲、為乙。</
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<
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">以甲為心。</
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<
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">向丙點相望處。</
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<
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<
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