Terentius, Johannes; Zheng, Wang 王徴
,
Yuan xi qi qi tu shuo lu zui 遠西奇器圖說錄最
,
[1830]
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1
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X03/01/111.jpg
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<
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id
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N1127B
"> 第十二款 有三角形,從角至對線,於中作一直
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線,直線內有重之心。</
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<
s
id
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N11285
"> 假如從a角至e i對線,作一直線,
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於o分兩平分,必定a o之內有重
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心也。</
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<
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N1128C
">e至u亦然。</
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</
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<
s
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N11296
"> 第十三款 有三角形,其重心與形心同所。</
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<
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N11299
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<
s
id
="
N1129E
"> 假如上三角形,a為形心,亦為重心。</
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<
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id
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N112A1
"/>
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