There are two identical rectangles, 8 decimeters long and 4 decimeters wide. If you put them together into a rectangle, how many decimeters is the circumference of the rectangle? If you make a square, how many decimeters is the circumference of the square?

(1) The length of the rectangle is: 8 + 8 = 16 (decimeter), the perimeter of the rectangle is: (16 + 4) × 2, = 20 × 2, = 40 (decimeter); (2) the side length of the square is 8 decimeters, the perimeter of the square is: 8 × 4 = 32 (decimeter); a: the perimeter of the rectangle is 40 decimeters; the perimeter of the square is 32 decimeters

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