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zexius
A square has 4 sides.

If the perimeter around the square is 12cm, then you do 12 ÷ 4, which is 3.

Each side is 3cm long. 
If the perimeter of a square is 12cm and you are looking for the length of one side. You divide 12cm by 4 because it is a square and you get 3cm for one of the lengths of the side. 

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