How to use three cuboids of length 3, width 2 and height 1 to make a large cube? How to make the smallest surface area? The unit is centimeter

How to use three cuboids of length 3, width 2 and height 1 to make a large cube? How to make the smallest surface area? The unit is centimeter

3 * 3 * 2 * 1 = 18 cm3
If the volume of cube is lengthened to 3 root 2, it's hard to spell