2
(Circle)
3
1.) O O 2.) C , D , E OE , OD OC 3.) C D CD O CD
4). AB 5.) 6.) OX
4
2
1. ACB m(
)
2. ADB m(
)
3. F F
5
- CD -E - AB
1. PQ 2. A , B , C
6
1. C 2. O 3.
4 Q1, Q2 Q3
2 4 360
7
1 90 360
:OXB :O,B,X
8
1.
2.
3.
4. 2
9
5. 2 2 A B
6. 2 ""
7. 3 2 ABC
10
8. 2
9. 90 ACB = 90째
10. AOC ACB
11
11.
-o=E : AOB = CED : AB = CD
-O=E : AB = CD : AOB = CED 12.
12
-X=Y : ACB = MON : AB = MN -X=Y : AB = MN : ACB = MON 13.
- M= N : AB = CD : AB = CD -E=F : XY = OS : XY = OS 14
13
15.
-O : OC AB C : AC = CB
-O : AC = CB : OC = AB 16.
-O : MN AB M : MN O 14
17.
:A,B C :A,BC 18.
: AEC , ADC ABC
AC
: AEC= ADC= ABC 19.
: ABDC : A + D= 180째 B + C= 180째 15
20.
: ABDC : ADC= CBE 21 . 180째
ABC + ADC = 180째 BAD+ BCD = 180째
16
22.
: OC O AB C : OT AB 23.
: MQ , NP M O P Q : MP = MQ 24.
: CD,CE,CF AB C : BCD = CED = CFD 17
1. () 2. 3. 4. 5.
6. 7.
1. 2. 2 18
3. 4. 2 5.
1. ACB 2. ADB 3. F
1. C 2. O 1. 19
2. 3. 4. 5. 6. 7. 8.
1. 2 2. 3.
1. AB 2. CD 3. E 20
1. 2. 3. 4.
1. n
=
180n – 360 (n=)
2. n 3. n 4. n
=
( n – 2 ) 180 =
360 =
n(n–3)
= ( n – 2 ) 180
21
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