r=8.5cm/2=4.25cm
V=π*r^2*h=3.14*(4.25cm)^2*23cm=1304.5cm^3=1.3045m^3
π取的是约值3.14,结果也是约值
钢锻的容重=29kg/1.3045m^3=22.23kg/m^3