length of a side = 14.7cm
Perimeter = 58.8cm
Explanation:
The area of a square = 215 cm²
Area of a square = length²
Find the square root of both sides:
length = √Area
length = √215cm²
length of a side = 14.7cm (nearest tenth)
Perimeter = length +length +length +length
Perimeter = 4*Length
[tex]\begin{gathered} \text{perimeter = 4}\times\text{ 14.7} \\ \text{perimeter = }58.8\operatorname{cm} \end{gathered}[/tex]