The perimeter of any shape is the sum of all the sides of the shape.
The perimeter of a square is the sum of all four equal lengths. It is given by the formula
[tex]P_{\text{square}}=4\times length[/tex]From the question, the length, l=14mm.
[tex]\begin{gathered} P_{\text{square}}=4\times14\operatorname{mm} \\ P_{\text{square}}=56\operatorname{mm} \end{gathered}[/tex]Hence, the perimeter of the square that has a side length of 14mm is 56mm
