The side length of the square is 205 cm. Calculate the perimeter of this square.

Since the side of the square is known, we can find the value of its perimeter as the sum of all its sides. Since a square has 4 equal sides, we multiply the length of one side of the square by 4 and get the perimeter of the square:
205 * 4 = 820 cm.
Answer: the square has a perimeter of 820 cm.

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