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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<
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">第八十九款 有藤線、高線之比例,求其角。</
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<
s
id
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"> 假如藤線之長八分,其高線一分,要
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求其角,有數法,有線法。</
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<
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N129DD
">數法用比例:
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<
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">一 八分 藤線之長
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<
s
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<
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">四 一萬二千五百 為半弦,其角為七度十一分,如所求。</
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<
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id
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"> 線法:有ae直線分兩分于i。</
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<
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">以i
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為心,以a為界,作半圓形如aue。</
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<
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因ae為八分,取一分從a到o,在
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圓界線上為ao直線。</
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<
s
id
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N12A15
">o與e作直
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