1)体积是40X30X55=66000㎝³,表面积:2(40X30+40X55+30X55)=10100
2)V=3X3X2.5X3.14÷3×1.8=42.39吨.
3)V正=4×4×4 V圆=3.14×4×2×2 V圆÷V正=78.5%