Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
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31
(九)
32
(一〇)
33
(一一)
34
(一二)
35
(一三)
36
(一四)
37
(一五)
38
(一六)
39
(一七)
40
(一八)
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1 - 10
11 - 20
21 - 30
31 - 40
41 - 50
51 - 60
61 - 70
71 - 80
81 - 90
91 - 100
101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
211 - 220
221 - 230
231 - 240
241 - 250
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271 - 280
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(一三
[13]
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of 399
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一三
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13
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幾何原本 卷一之首
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31
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<
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<
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xml:space
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">乙戊甲辛壬庚丁己丙</
variables
>
</
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<
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-1
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xml:id
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<
s
xml:id
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xml:space
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">凡平行線方形。</
s
>
<
s
xml:id
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N10EA5
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xml:space
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">若於兩對角作一直線。</
s
>
<
s
xml:id
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N10EA8
"
xml:space
="
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">其直線為對角線。</
s
>
<
s
xml:id
="
N10EAB
"
xml:space
="
preserve
">又於兩邊縱橫各作一
<
lb
/>
平行線。</
s
>
<
s
xml:id
="
N10EB0
"
xml:space
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preserve
">其兩平行線與對角線交羅相遇。</
s
>
<
s
xml:id
="
N10EB3
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xml:space
="
preserve
">卽此形分為四平行線方形。</
s
>
<
s
xml:id
="
N10EB6
"
xml:space
="
preserve
">其兩形
<
lb
/>
有對角線者。</
s
>
<
s
xml:id
="
N10EBB
"
xml:space
="
preserve
">為角線方形。</
s
>
<
s
xml:id
="
N10EBE
"
xml:space
="
preserve
">其兩形無對角線者。</
s
>
<
s
xml:id
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xml:space
="
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">為餘方形。</
s
>
</
p
>
<
p
xml:id
="
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<
s
xml:id
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xml:space
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">甲乙丁丙方形。</
s
>
<
s
xml:id
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xml:space
="
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">於丙乙兩角作一線。</
s
>
<
s
xml:id
="
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xml:space
="
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">為對角線。</
s
>
<
s
xml:id
="
N10ECE
"
xml:space
="
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">又依乙丁平行。</
s
>
<
s
xml:id
="
N10ED1
"
xml:space
="
preserve
">作戊己線。</
s
>
<
s
xml:id
="
N10ED4
"
xml:space
="
preserve
">依甲
<
lb
/>
乙平行作庚辛線。</
s
>
<
s
xml:id
="
N10ED9
"
xml:space
="
preserve
">其對角線與戊己、庚辛、兩線。</
s
>
<
s
xml:id
="
N10EDC
"
xml:space
="
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">交羅相遇於壬。</
s
>
<
s
xml:id
="
N10EDF
"
xml:space
="
preserve
">卽作大小四平
<
lb
/>
行線方形矣。</
s
>
<
s
xml:id
="
N10EE4
"
xml:space
="
preserve
">則庚壬己丙、及戊壬辛乙、兩方形。</
s
>
<
s
xml:id
="
N10EE7
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xml:space
="
preserve
">謂之角線方形。</
s
>
<
s
xml:id
="
N10EEA
"
xml:space
="
preserve
">而甲庚壬戊、及
<
lb
/>
壬己丁辛、謂之餘方形。</
s
>
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>
<
head
xml:id
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xml:space
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">求作四則</
head
>
<
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<
s
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">求作者。</
s
>
<
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xml:space
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">不得言不可作。</
s
>
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<
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>
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<
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">第一求</
head
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<
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-1
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<
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xml:id
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">自此點至彼點。</
s
>
<
s
xml:id
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xml:space
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">求作一直線。</
s
>
</
p
>
<
p
xml:id
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N10F0C
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<
s
xml:id
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N10F0D
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xml:space
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">此求亦出上篇。</
s
>
<
s
xml:id
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xml:space
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">蓋自此點直行至彼點。</
s
>
<
s
xml:id
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xml:space
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">卽是直線。</
s
>
</
p
>
<
p
xml:id
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">
<
s
xml:id
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xml:space
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">自甲至乙或至丙、至丁。</
s
>
<
s
xml:id
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xml:space
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">俱可作直線。</
s
>
</
p
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2
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<
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">第二求</
head
>
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