Divide the top of the graph 1 into 5 parts, and divide the two sides into 3 parts to get Figure 2. Since the length of a line segment does not change no matter how many parts it is divided into, the length of the line segment does not change no matter where it is translated, so the perimeter of 1 is equal to the perimeter of 2.

In fig. 3, the two right angles in fig. 2 are directly changed into hypotenuse. Since the sum of two sides in a triangle is greater than the third side, the circumference of 2 is greater than that of 3.