Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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(三六
[36]
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幾何原本 卷一
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">己庚甲丙乙戊丁</
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<
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">庚甲丙、與庚丙戊、兩角形之甲丙、戊丙、兩線旣等。</
s
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">庚丙同線。</
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">戊丙庚、與甲丙庚、兩角又等。</
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<
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戊庚、兩線必等。</
s
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">本篇四</
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<
s
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">而對同邊之甲角戊角、亦等。</
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<
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<
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<
s
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<
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<
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直角。</
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<
s
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">是甲庚為甲乙之垂線。</
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<
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<
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<
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">甲點上、欲立垂線。</
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元線上方。</
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">作大半圜。</
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<
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線相遇、為丁。</
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">次自丁至丙作直線。</
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">引長之至戊、為戊丁線。</
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">戊丁與圜界相
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遇為己。</
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<
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">此法今未能論。</
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">論見第三卷第三十一題。</
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