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

6

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

7

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

8

2.

(...)

(...)

( ...)

(...)

( ...)

9

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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10

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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12

13

2.2

1.

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.......................................................................................................................................... 2. AB CD O ABCD

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14

3. ABCD E F AD BC EB DF DFBE

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15

4.

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