圆柱的底面积=50.24÷2=25.12(m²)则r²=25.12÷3.14=8∴圆柱的半径r=√(25.12÷π)=2√2(m)∴圆柱的直径D=4√2(m)则圆柱的高h=(120÷2)÷4√2=15√2/2圆柱的表面积=2×π×2√2+25.12×2≈68.01(cm²)