:

:
1-
2-
3- 180
4-
5- =
6- =




:

:
1-
2-
3- 180
4-
5-
6-
7- =
1/2 ( )
8- = 4




:

:
1-
2-
3-
4- =
5- = 2 ( + )




:




:
1-
2-
3-
4-
5-
6-
7- = 4
=
8- =
1/2 2 =