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             2868     2011-9-23

180 90 180

1 180

2

3

4 180

(1) (2)

(1) (2) (1) (2) (3)

( )

1 (1) 1

1

2 1 (2) (2) 1 2 1+ 2=

1 2 1

3 (2) (3) 1+ 2+ 3=

1 2 180 180 179 178 181 182

( )

1

(3) 1 2 3 1 2 3

2 180

(1) 180

180 180 180

(2) 180

(4) 1 2 3 3 ( ) 1 2 3 1 2 3 ( 5) 1 2 3 3 1 2 ( ) 3 1 2 3 180 1 2 0 180

3

4

5

(1) 180

( ) 180

180 ( 180 + n 360 n 360 )

(2) 180

(6) 180

(7) 1

(8) 2 1+ 2

(9) 3 1+ 2+ 3

180 1+ 2+ 3=180 180


(10)

A+ B+ C=180

180 180 180 180

( )

1 A+ B+ C=180 (1) A B C ABC B=50 C=100 A (2) A B C ABC B=50 C B 50 ( C B 2 )( B C ) A

2

ABC (11) ABD ADC

(1) ABC 180

(2) ABD 90

(3) ADC 90

( ) ( ) ( )

    180

 

 

180 90 180

1 180

2

3

4 180

(1) (2)

(1) (2) (1) (2) (3)

( )

1 (1) 1

1

2 1 (2) (2) 1 2 1+ 2=

1 2 1

3 (2) (3) 1+ 2+ 3=

1 2 180 180 179 178 181 182

( )

1

(3) 1 2 3 1 2 3

2 180

(1) 180

180 180 180

(2) 180

(4) 1 2 3 3 ( ) 1 2 3 1 2 3 ( 5) 1 2 3 3 1 2 ( ) 3 1 2 3 180 1 2 0 180

3

4

5

(1) 180

( ) 180

180 ( 180 + n 360 n 360 )

(2) 180

(6) 180

(7) 1

(8) 2 1+ 2

(9) 3 1+ 2+ 3

180 1+ 2+ 3=180 180


(10)

A+ B+ C=180

180 180 180 180

( )

1 A+ B+ C=180 (1) A B C ABC B=50 C=100 A (2) A B C ABC B=50 C B 50 ( C B 2 )( B C ) A

2

ABC (11) ABD ADC

(1) ABC 180

(2) ABD 90

(3) ADC 90

( ) ( ) ( )

    180


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