全部的S都算扇形面积,除注明（S扇,和S）S算圆的面积,S扇算扇形

=2
a=60°
s=12.56
r=7
a=120°
s=153.86
r=0.1
a=90°
s=0.0314
r=0.1
a=135°
d=0.2
s=0.0314
r=0.1
a=180°
s=0.0314
d=60
a=270°
s=2826
c=188.4
d=40
a=30°
r=20
c=125.6
s=125.6
s扇=10.47
c=3.14
a=100°
r=0.5
s=0.785
c=125.6
s=251.2
r=20
a=72
c
28.26
s=127.17
d=9
r=4.5
s=63.585
a= 720