72
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72 because if the area is 324 and you make a block chart and count the sides it will equal 72
72/4 = 18. Each side of the square is 18, so 18 x 18 = 324. 324 is the area.
The square root of 324 is 18 so the perimeter must be 4*18 = 72 cm
A square with an area of 400 square units has a perimeter of 80 units.
When the area of a square is 36cm2, its perimeter is: 24 cm