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1
1
1.
1. ABCD ABCD 2. 3. a a2
... ...
2 .. .. 2
2
1.1
1.
1) 2) ABCD ABCD 3) 4) 5)
2.
3
1)
2)
3)
4) 180
5)
4
2
1. 2.
1 ABCD ABC
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A B
C D
5
180
180
2 360
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A B
C
D
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1.2
1.
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2.
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1 = 4 3 + 2 = 180
1
2
3 4
EF AB CD E F AE X = DF Y AB CD
C
A B
D
X
E
F
Y
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3.
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4.
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AB // CD GH AB CD E F 1) GE A = DF H 2) GE B + CF E = 180
C
A B
D
X
E
F
Y
AB // CD DE BC E BE D = AB E + ED C
C
A B
D
E
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2.
(...)
(...)
( ...)
(...)
( ...)
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2.1
1. AC BD M AB // DC
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2. ABC DBC BC AB = AC DB = DC AD ABD ACD
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3. ABC AB = AC CD BE AB AC D E CD = BE AD = AE
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4. ABC A = B = C ABC
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5.
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2.2
1.
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.......................................................................................................................................... 2. AB CD O ABCD
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3. ABCD E F AD BC EB DF DFBE
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