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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言丁在甲、丙元線之內。</
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丁等也。</
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<
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丙至丁、作丙丁線。</
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三角形。</
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戊。</
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線兩端之兩角、乙丁丙、乙丙丁。</
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