We have no idea what "a 64cm square" means, since such a thing cannot exist.
If you mean to say "a square with an area of 64 square cm", then its side length is 8 cm.
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8cm.
64 get divided to its base multipliers (8x8) meaning that each side is 8
Area = 64 cm2 so length of side = 8cm Then, by Pythagoras, length of diagonal = sqrt[82 + 82] = 8*sqrt(2) = 11.3137 cm (to 4 dp)
The perimeter of any polygon is the sum of the lengths of all the sides. Specifically in the case of a square, since it has 4 sides of equal length, the perimeter is simply 4 times the length of any side.
The area of a square is the square of its side length.
Divide the length of the diagonal of a square by 1.4142 (which is the square root of 2) to find the length of a side. Similarly, to find the length of the diagonal of a square, multiply the length of a side by 1.4142.
The length of a side is the square root of the area. √5.76 = 2.4 so the length of a side is 2.4 inches in this case.