If the area of a square is 49 cm, what is the length of one side of it?

All 4 sides of the square are the same length. Opposite sides of the figure are parallel to each other.
We write down the formula for determining the area of a square:
S = a * a = a ^ 2;
S is the area of the square;
a is the length of its side.
Let us derive the length of the side of the square from the formula and find its value:
a ^ 2 = S;
a = √S = √49 cm2 = 7 cm.
Answer: The length of the side of the square is 7 cm.