Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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31
(九)
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(一〇)
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(一一)
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(一二)
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(一三)
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(一四)
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(一五)
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(一八)
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幾何原本 卷一
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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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">任作戊己圜界。</
s
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<
s
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s
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<
s
xml:id
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<
lb
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心。</
s
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<
s
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">作庚辛圜界。</
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<
s
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xml:space
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<
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">於庚辛圜界。</
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<
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">截取庚辛。</
s
>
<
s
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xml:space
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>
<
s
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<
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之。</
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<
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<
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<
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">以甲點為心。</
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<
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">於乙丙線近乙處。</
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<
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xml:space
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">任指一點作短界線、為丁。</
s
>
<
s
xml:id
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xml:space
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">次用元度。</
s
>
<
s
xml:id
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xml:space
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">以丁為心。</
s
>
<
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xml:space
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">於乙丙上。</
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>
<
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xml:id
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<
lb
/>
截取一分、作短界線、為戊。</
s
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<
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xml:id
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xml:space
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">次用元度。</
s
>
<
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xml:id
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xml:space
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">以戊為心。</
s
>
<
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xml:space
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">向上與甲平處、作短界線。</
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<
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xml:space
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">又用元度。</
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>
<
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xml:space
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">以甲為心。</
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>
<
s
xml:id
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"
xml:space
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">向甲平
<
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/>
處、作短界線。</
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<
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">後兩界線交處、為己。</
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">自甲至己、作直線。</
s
>
<
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">各引長之。</
s
>
<
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<
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xml:space
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">辛甲丙丁戊乙己庚</
variables
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number
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<
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file
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<
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">己甲
<
lb
/>
丙戊丁乙</
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4
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<
head
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">第三十二題</
head
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-1
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<
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xml:space
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">凡三角形之外角、與相對之內兩角幷、等。</
s
>
<
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xml:id
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xml:space
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preserve
">凡三角形之內三角幷、與兩直角等。</
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