(1)40x30.4=1216,(2)h=12.56/(2x3.14x0.4)=5米,S=12.56x100+2x4x4x3.14=1356.48平方分米,(3)3/2x3/2x3.14+2x3.14x1.5x2=25.905,(4),2x3.14x62.8x62.8/4/3.14/3.14+2x3.14x62.8x62.8/2/3.14=4257.84
(1)40x30.4=1216,(2)h=12.56/(2x3.14x0.4)=5米,S=12.56x100+2x4x4x3.14=1356.48平方分米,(3)3/2x3/2x3.14+2x3.14x1.5x2=25.905,(4),2x3.14x62.8x62.8/4/3.14/3.14+2x3.14x62.8x62.8/2/3.14=4257.84