If the area is one square meter, the side length is one meter. Therefore, the perimeter is four meters.
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If the perimeter of a square is 30 cm, each side is 7.5 cm and the area is 56.25 sq cm. For a square to have an area of 30 sq cm each side would have to be 5.48cm.
The perimeter is not going to have sq units. If the perimeter of a square is 15 units then the area would be 14.0625units squared.
9 sq cm
It is 48 cm.
The cm is a length so I presume the question asks for the perimeter of a square with 1m sides. In that case 400cm. On the other hand if it is an infinitely long, infinitely narrow rectangle with area 1 sq m, the answer is an infinity of cm.