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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曰:先打直線a至c,用規矩取ai
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柱徑之長。</
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<
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id
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N129AB
">按直線ai等于徑要三
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lb
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個再加七分之一,為uo,就有ae
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lb
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i柱之圓界。</
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<
s
id
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N129B2
">又用規矩,從ai處作
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一角形,等于斜角形。</
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<
s
id
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N129B7
">o上打垂線,遇
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lb
/>
角上斜線至p,就有三角形。</
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>
<
s
id
="
N129BC
">ao為
<
lb
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柱底圓界一周,則ap為藤線之一
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周矣。</
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>
<
s
id
="
N129C3
">移a角之尖到p,接轉而上,
<
lb
/>
可至無窮。</
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id
="
N129C8
"/>
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</
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</
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