13cm
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A square with a side length of 13cm (52/4) has an area of 169cm2
The area of a square is s2, where s is the measurement of one side. A = 132 = 169cm2.
Yes, since they're squares. They can only be 3 inches by 3 inches if they are square. So they all have the same area.
If, by changing the size of the squares you mean increasing the length of the side by some multiple, then the perimeter increases in direct proportion to the length of the side while the area increases in direct proportion to the square of the side. If, by changing the size of the the squares you mean increasing the length of the side from x units by some fixed small amount, dx units, then the perimeter will increase by 4*dx while the area will increase by 2*x*dx
All four sides of a square are equal in length, therefore: area = length of a side squared length of a side = √[area] length x 4 = perimeter If the area is in cm² the length will be in cm.