s=s圆+s方 =2∏r^2+46*100 =2∏23*23+46*100 =1661.06+4600 =6216.06 2. 200=100+∏r内+a 200=3.14*20+100+a a=37.2 200=100+∏r中+b 200=3.14*21+100+b b=34.06 200=100+∏r外+c 200=3.14*22+100+c b=30.92 c-b=b-a=3.14 3.s=s大-s小 =6216.06-100*20 =4216.06 4216.06*130=548087.8元