Euclides 歐幾里得
,
Ji he yuan ben 幾何原本
,
1966
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Figures
Content
Thumbnails
List of thumbnails
<
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
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 399
>
21
(一)
22
23
24
(二)
25
(三)
26
(四)
27
(五)
28
(六)
29
(七)
30
(八)
<
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
251 - 260
261 - 270
271 - 280
281 - 290
291 - 300
301 - 310
311 - 320
321 - 330
331 - 340
341 - 350
351 - 360
361 - 370
371 - 380
381 - 390
391 - 399
>
page
|<
<
(六二
[62]
)
of 399
>
>|
<
echo
version
="
1.0RC
">
<
text
type
="
book
"
xml:lang
="
zh
">
<
div
xml:id
="
echoid-div4
"
type
="
body
"
level
="
1
"
n
="
1
">
<
div
xml:id
="
N10950
"
level
="
2
"
n
="
1
"
type
="
chapter
">
<
div
xml:id
="
N112CC
"
level
="
3
"
n
="
1
"
type
="
chaptermain
">
<
div
xml:id
="
N12B23
"
level
="
4
"
n
="
32
"
type
="
problem
"
type-free
="
題
">
<
pb
n
="
84
"
file
="
0084
"
o
="
六二
"
o-norm
="
62
"
rhead
="
幾何原本 卷一
"
xlink:href
="
http://libcoll.mpiwg-berlin.mpg.de/libview?url=/mpiwg/online/permanent/library/02NT95YF/pageimg&mode=imagepath&pn=84
"/>
<
figure
xml:id
="
N12C6E
"
number
="
138
">
<
image
file
="
0084-01
"/>
<
description
xml:id
="
N12C6F
"
xml:space
="
preserve
">一</
description
>
<
description
xml:id
="
N12C71
"
xml:space
="
preserve
">二</
description
>
<
description
xml:id
="
N12C73
"
xml:space
="
preserve
">三</
description
>
<
description
xml:id
="
N12C75
"
xml:space
="
preserve
">四</
description
>
</
figure
>
<
p
xml:id
="
N12C77
">
<
s
xml:id
="
N12C78
"
xml:space
="
preserve
">又一法。</
s
>
<
s
xml:id
="
N12C7B
"
xml:space
="
preserve
">每形視其邊數。</
s
>
<
s
xml:id
="
N12C7E
"
xml:space
="
preserve
">每邊當兩直角。</
s
>
<
s
xml:id
="
N12C81
"
xml:space
="
preserve
">而減四直角。</
s
>
<
s
xml:id
="
N12C84
"
xml:space
="
preserve
">其存者。</
s
>
<
s
xml:id
="
N12C87
"
xml:space
="
preserve
">卽本形所當直角。</
s
>
</
p
>
<
p
xml:id
="
N12C8A
">
<
s
xml:id
="
N12C8B
"
xml:space
="
preserve
">論曰。</
s
>
<
s
xml:id
="
N12C8E
"
xml:space
="
preserve
">欲顯此理。</
s
>
<
s
xml:id
="
N12C91
"
xml:space
="
preserve
">試於形中任作一點。</
s
>
<
s
xml:id
="
N12C94
"
xml:space
="
preserve
">從此點向各角、俱作直線。</
s
>
<
s
xml:id
="
N12C97
"
xml:space
="
preserve
">令每形所分角形之
<
lb
/>
數。</
s
>
<
s
xml:id
="
N12C9C
"
xml:space
="
preserve
">如其邊數。</
s
>
<
s
xml:id
="
N12C9F
"
xml:space
="
preserve
">每一分形三角。</
s
>
<
s
xml:id
="
N12CA2
"
xml:space
="
preserve
">當二直角。</
s
>
<
s
xml:id
="
N12CA5
"
xml:space
="
preserve
">(</
s
>
<
s
xml:id
="
N12CA7
"
xml:space
="
preserve
">本題</
s
>
<
s
xml:id
="
echoid-s2943
"
xml:space
="
preserve
">)</
s
>
<
s
xml:id
="
N12CAD
"
xml:space
="
preserve
">其近點之處。</
s
>
<
s
xml:id
="
N12CB0
"
xml:space
="
preserve
">不論幾角。</
s
>
<
s
xml:id
="
N12CB3
"
xml:space
="
preserve
">皆當四直角。</
s
>
<
s
xml:id
="
N12CB6
"
xml:space
="
preserve
">(</
s
>
<
s
xml:id
="
N12CB8
"
xml:space
="
preserve
">本篇十五
<
lb
/>
之系。</
s
>
<
s
xml:id
="
echoid-s2949
"
xml:space
="
preserve
">)</
s
>
<
s
xml:id
="
N12CC3
"
xml:space
="
preserve
">次減近點諸角。</
s
>
<
s
xml:id
="
N12CC6
"
xml:space
="
preserve
">卽是減四直角。</
s
>
<
s
xml:id
="
N12CC9
"
xml:space
="
preserve
">其存者。</
s
>
<
s
xml:id
="
N12CCC
"
xml:space
="
preserve
">則本形所當直角。</
s
>
<
s
xml:id
="
N12CCF
"
xml:space
="
preserve
">如上第四形六邊。</
s
>
<
s
xml:id
="
N12CD2
"
xml:space
="
preserve
">中間
<
lb
/>
任指一點。</
s
>
<
s
xml:id
="
N12CD7
"
xml:space
="
preserve
">從點向各角分為六三角形。</
s
>
<
s
xml:id
="
N12CDA
"
xml:space
="
preserve
">每一分形三角。</
s
>
<
s
xml:id
="
N12CDD
"
xml:space
="
preserve
">六形共十八角。</
s
>
<
s
xml:id
="
N12CE0
"
xml:space
="
preserve
">今於近點處
<
lb
/>
減當四直角之六角。</
s
>
<
s
xml:id
="
N12CE5
"
xml:space
="
preserve
">所存近邊十二角。</
s
>
<
s
xml:id
="
N12CE8
"
xml:space
="
preserve
">當八直角。</
s
>
<
s
xml:id
="
N12CEB
"
xml:space
="
preserve
">餘倣此。</
s
>
</
p
>
<
p
xml:id
="
N12CEE
">
<
s
xml:id
="
N12CEF
"
xml:space
="
preserve
">一系。</
s
>
<
s
xml:id
="
N12CF2
"
xml:space
="
preserve
">凡諸種角形之三角幷、俱相等。</
s
>
<
s
xml:id
="
N12CF5
"
xml:space
="
preserve
">(</
s
>
<
s
xml:id
="
N12CF7
"
xml:space
="
preserve
">本題增。</
s
>
<
s
xml:id
="
echoid-s2967
"
xml:space
="
preserve
">)</
s
>
</
p
>
<
p
xml:id
="
N12CFD
">
<
s
xml:id
="
N12CFE
"
xml:space
="
preserve
">二系。</
s
>
<
s
xml:id
="
N12D01
"
xml:space
="
preserve
">凡兩腰等角形。</
s
>
<
s
xml:id
="
N12D04
"
xml:space
="
preserve
">若腰間直角。</
s
>
<
s
xml:id
="
N12D07
"
xml:space
="
preserve
">則餘兩角、每當直角之半。</
s
>
<
s
xml:id
="
N12D0A
"
xml:space
="
preserve
">腰間鈍角。</
s
>
<
s
xml:id
="
N12D0D
"
xml:space
="
preserve
">則餘兩角、俱
<
lb
/>
小於半直角。</
s
>
<
s
xml:id
="
N12D12
"
xml:space
="
preserve
">腰間銳角。</
s
>
<
s
xml:id
="
N12D15
"
xml:space
="
preserve
">則餘兩角、俱大於半直角。</
s
>
</
p
>
<
p
xml:id
="
N12D18
">
<
s
xml:id
="
N12D19
"
xml:space
="
preserve
">三系。</
s
>
<
s
xml:id
="
N12D1C
"
xml:space
="
preserve
">平邊角形。</
s
>
<
s
xml:id
="
N12D1F
"
xml:space
="
preserve
">每角當直角三分之二。</
s
>
</
p
>
<
figure
xml:id
="
N12D22
"
number
="
139
">
<
image
file
="
0084-02
"/>
<
variables
xml:id
="
N12D23
"
xml:space
="
preserve
">丙丁戊甲乙</
variables
>
</
figure
>
<
p
xml:id
="
N12D25
">
<
s
xml:id
="
N12D26
"
xml:space
="
preserve
">四系。</
s
>
<
s
xml:id
="
N12D29
"
xml:space
="
preserve
">平邊角形。</
s
>
<
s
xml:id
="
N12D2C
"
xml:space
="
preserve
">若從一角向對邊、作垂線。</
s
>
<
s
xml:id
="
N12D2F
"
xml:space
="
preserve
">分為兩角形。</
s
>
<
s
xml:id
="
N12D32
"
xml:space
="
preserve
">此分形、各有一直角、
<
lb
/>
在垂線之下兩旁。</
s
>
<
s
xml:id
="
N12D37
"
xml:space
="
preserve
">則垂線之上兩旁角。</
s
>
<
s
xml:id
="
N12D3A
"
xml:space
="
preserve
">每當直角三分之一。</
s
>
<
s
xml:id
="
N12D3D
"
xml:space
="
preserve
">其餘兩角。</
s
>
<
s
xml:id
="
N12D40
"
xml:space
="
preserve
">每當
<
lb
/>
直角三分之二。</
s
>
</
p
>
<
p
xml:id
="
N12D45
">
<
s
xml:id
="
N12D46
"
xml:space
="
preserve
">增。</
s
>
<
s
xml:id
="
N12D49
"
xml:space
="
preserve
">從三系、可分一直角為三平分。</
s
>
<
s
xml:id
="
N12D4C
"
xml:space
="
preserve
">其法任於一邊、立平邊角形。</
s
>
<
s
xml:id
="
N12D4F
"
xml:space
="
preserve
">次分對直角
<
lb
/>
一邊為兩平分。</
s
>
<
s
xml:id
="
N12D54
"
xml:space
="
preserve
">從此邊對角作垂線、卽所求。</
s
>
<
s
xml:id
="
N12D57
"
xml:space
="
preserve
">如上圖。</
s
>
<
s
xml:id
="
N12D5A
"
xml:space
="
preserve
">甲乙丙直角。</
s
>
<
s
xml:id
="
N12D5D
"
xml:space
="
preserve
">求三分之。</
s
>
</
p
>
</
div
>
</
div
>
</
div
>
</
div
>
</
text
>
</
echo
>