一个圆柱的半径是3.2dm,高5dm.这个圆柱的侧面积是 .
9÷ == :8=0.75= %= 折.
=0.375= ÷24= %
:20==0.8=12÷ = %.
6÷ ==0.75= :40= %
1÷ =0.125= :16== %