If the side length of the square is 7 inches, then the area of the square is 49 ${\text{in}}^2$.

If the side length of the square is 49 inches, then the area of the square is 7 ${\text{in}}^2$.

If the area of the square is 7 ${\text{in}}^2$, then the side length of the square is 49 inches.

If the area of the square is 49 ${\text{in}}^2$, then the side length of the square is 7 inches.