7. If the area of a square is $50 \mathrm{~cm}^{2}$, what is the approximate perimeter of the square?

Step 1 ：Find the side length by taking the square root of the area: \(side = \sqrt{50} \approx 7.07 \mathrm{~cm}\)

Step 2 ：Find the perimeter by multiplying the side length by 4: \(perimeter = 4 \times 7.07 \approx 28.28 \mathrm{~cm}\)

Step 3 ：\(\boxed{The \approx perimeter \ of \ the \ square \ is \ 28.28 \ cm}\)