125.6÷(3.14x2x2)=125.6÷12.56=10厘米
【解】设半径为r,高为h,则:2π(r+2)h-2πrh=125.6 解得h=10cm
设高为H2*(R+2)π*H=2*π*RH+125.64πH=125.6H=125.6/4π
设半径r 高h2(r+2)πh-2rπh=125.6得 h=31.4/π π取3.14的话,h=10
s侧=3.14*d*h3.14*4*h=125.6h=10