ANSWER
P = 79.2
EXPLANATION
We want to find the perimeter of the square given only its diagonal.
To do that, we use the formula:
[tex]P\text{ = 2 }\sqrt[]{2}\cdot\text{ D}[/tex]
where D = length of diagonal
The diagonal of the square is 28.
Therefore, we have that:
[tex]\begin{gathered} P\text{ = 2 }\sqrt[]{2}\cdot\text{ 28} \\ P\text{ = }2.828\cdot\text{ 28} \\ P\text{ = }\cong79.2 \end{gathered}[/tex]
That is the answer.
