[tex]50 {cm}^{2} = {a}^{2} \\ a = \sqrt{50} \\ a = \sqrt{25 \times 2} \\ \boxed{ a = 5 \sqrt{2} cm}[/tex]
Zatem obwód
[tex]5 \sqrt{2}cm \times 4 = \boxed{\boxed{20 \sqrt{2}cm }}[/tex]
