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Mathematics in the third grade of primary school: How many rectangles or squares can be enclosed with a circumference of 24 cm?
Suppose the length is a and the width is b.

Circumference =2A+2B=24, then A+B= 12 is equivalent to 4A=24 A=6 for a square.

There are five kinds of rectangles.

Length 1 1 10 9 8 7

Width 1 2 3 4 5