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 卷一之首
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<
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s
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<
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xml:space
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number
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9
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<
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xml:space
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>
</
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>
<
p
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<
s
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">凡言甲乙丙角。</
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xml:space
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<
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">如上甲乙、乙丙、二線。</
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s
>
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">不能作角。</
s
>
</
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>
<
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<
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xml:space
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">如上甲乙、乙丙、二線。</
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>
<
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">雖相遇。</
s
>
<
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">不作平角。</
s
>
<
s
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xml:space
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">為是曲線。</
s
>
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>
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<
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">所謂角。</
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>
<
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">止是兩線相遇。</
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<
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">不以線之大小較論。</
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>
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head
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">第九界</
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>
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-1
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<
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">直線相遇作角。</
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>
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">為直線角。</
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>
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>
<
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<
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">平地兩直線相遇。</
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>
<
s
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">為直線角。</
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>
<
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">本書中所論止是直線角。</
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>
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">但作角有三等。</
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">今附蓍於此。</
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<
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">一直線角。</
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">二曲線角。</
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">三雜線角。</
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