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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111
112
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<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 390
391 - 404
>
page
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<
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<
chap
id
="
N10015
"
n
="
1
">
<
pb
xlink:href
="
X03/01/112.jpg
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<
lb
/>
<
p
type
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head
">
<
s
id
="
N112AA
"> 第十四款 求三角形重心。</
s
>
<
s
id
="
N112AD
"/>
</
p
>
<
p
type
="
main
">
<
s
id
="
N112B2
"> 法曰:有三角形,各分兩分。</
s
>
<
s
id
="
N112B5
">起線各至
<
lb
/>
角為一直線,相遇十字交處便是重
<
lb
/>
心。</
s
>
<
s
id
="
N112BC
">假如上a與e,中分有i,i至o
<
lb
/>
為一直線。</
s
>
<
s
id
="
N112C1
">次o與e,中分有u,u至
<
lb
/>
a為一直線。</
s
>
<
s
id
="
N112C6
">兩直線相遇十字於心,
<
lb
/>
即得所求。</
s
>
<
s
id
="
N112CB
"/>
</
p
>
</
chap
>
</
body
>
</
text
>
</
archimedes
>