There are several ways to spell a rectangle with three pieces of 3cm long and 2cm wide. How to spell the rectangle with the smallest surface area?

There are several ways to spell a rectangle with three pieces of 3cm long and 2cm wide. How to spell the rectangle with the smallest surface area?

Try to cover the long side by the wide side
Put three together, you can cover four times the width
The original surface area of a cuboid = (3 * 2 + 3 * 1 + 2 * 1) * 2 = 22 square centimeters
So the surface area after splicing = 22 * 3-3 * 2 * 4 = 42 square centimeters