*
90°
115°
140°
170°
90°
1
2
3
4
A
B
C
1
2
3
4
A
B
C
1
2
3
4
A
B
C
1
2
3
A
B
C
1
2
A
B
C
D
1
A
B
C
115°
1
2
A
B
1
2
3
4
A
B
C
D
1
2
3
A
B
C
D
1
2
3
A
B
C
D
1
2
A
B
C
D
1
2
A
B
C
D
140°
6
7
E
F
E
F
E
F
E
F
E
F
170°
1
2
1
2
A
B
1
2
3
A
B
C
1
2
A
B
C
D
1
2
A
B
C
D
1
2
A
B
C
D