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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(一〇五
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一〇五
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rhead
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幾何原本 卷二
"
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丁辛直角形。</
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<
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<
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<
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<
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角方形。</
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<
s
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">與庚丙直角形等。</
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<
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">而甲乙偕庚乙、矩線內直角形。</
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<
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">與甲庚上直角方形等也。</
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variables
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<
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<
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<
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">此題無數可解。</
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<
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">說見九卷十四題。</
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">第十二題</
head
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">三邊鈍角形之對鈍角邊上直角方形。</
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<
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">為鈍角旁任用一邊、偕其引增
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/>
線之與對角所下垂線相遇者、矩內直角形。</
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<
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<
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<
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">甲乙丙三邊鈍角形。</
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">與鈍角旁一邊如丙乙、之引增線、遇
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於丁。</
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<
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">為直角。</
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>
<
s
xml:id
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">題言對鈍角之甲丙邊上直角方形。</
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>
<
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">大於甲乙、乙丙、邊上兩直角方形幷、之較為丙乙偕
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乙丁、矩線內直角形二。</
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">反說之。</
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">則甲乙、乙丙、上兩直角方形、及丙乙偕乙丁、矩線內直角形二、幷。</
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<
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