圆柱的底面周长
=12.56÷8
=1.57分米
圆柱的底面半径
=1.57÷3.14÷2
=0.25分米
圆柱的表面积
=3.14×0.25²×2+12.56
=0.3925+12.56
=12.9525平方分米