正六边形的每一个外角都是( )
A:720°
B:360°
C:120°
D:60°
3.2+2.5
6.6
8.8-0.2
5.5+3.1
4.17
8.9-2.3
4.03+2.57
5.7
6.29-2.12
3.12+1.05
8.6
6.9-1.2