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Two identical rectangles, 9 cm in length and 6 cm in width, are stacked together. What is the circumference of the figure?
With the limit method, from vertical stack to near coincidence, the side length is constantly changing
As shown in the figure, two identical cuboids are stacked together to form a new cuboid. Among the new cuboids, the minimum surface area is square centimeter
Length: 6cm, width 5cm, height 4cm
The surface area of the cuboid is the smallest when the cuboid is contacted with the surface of 6cm in length and 5cm in width
The cuboid is 6 cm long, 5 cm wide and 4 × 2 = 8 cm high
（6×5+6×4+5×4）×2
=74×2
=148 square centimeters
The picture on the right is made up of eight squares with a side length of 2 cm. If you take out a square from it, the perimeter of this figure is () or 9 () cm
There are two rows, four in one row and eight in two rows
The perimeter is increased by 2 * 2cm on the original basis, which was originally 24cm
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