A square that is 5 cm on each side is a perfect square. It is 25 cm in area which is found by multiplying the length of one side by the base.
It's perimeter is the sum of its sides which is 4 x 5 cm = 20 cm.
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the surface are of a cube that is 5 cm long, wide, and high is 150 cm^2. Each side of the box is a square measuring 5cm x 5cm, so each side has an area of 25 square cm. A box has six sides, so the total surface area of all six sides is 6 x 25 square cm = 150 square cm.
Assuming by "equal" you mean that each side is 5 cm, then the perimeter of a square is 5 cm * 4 (sides) = 5 cm + 5 cm + 5 cm + 5 cm = 20 cm The perimeter of any polygon is the sum of the sides Alternatively if by "equal" you mean the sides sum to 5 cm, then the perimeter is 5 cm. Although this is probably not what you meant =)
What does the '5cm' represent??? Is it the length of the perimeter , or are you misunderstanding that the 5 cm is the length of one side. When described as a '5 cm square' is this the 'area'.
Area = 5*5 = 25 square cm
a line "a side" does not have an are because it is one-dimensional. A better question might be "what is the side length of a square that is 125 cm squared" In which case the side length would be the square root of 125 or 5*square root of 5.