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5cm
200mm
The length of a square is not determined by a formula, it is determined by measuring the square.
the perimeter of a rectangle with two 5cm squares will be 30cm
The perimeter is the total distance around a two-dimensional shape. To find the perimeter of a shape, you need to add up all the lengths of its sides. In this case, the perimeter of a shape with sides measuring 5cm and 2cm would be 5cm + 5cm + 2cm + 2cm = 14cm.