Question

ex 3.va rog frumos....

Answer 1

$A_{dreptunghi}=L*l = 8*4\to 32 cm^2 \\\\ A_d=A_p \\\\ A_{patrat}=l^2 \\\\\\ ===\ \textgreater \ l^2=32cm^2 \ \textless \ =\ \textgreater \ l=\sqrt{32} \to 4\sqrt{2} \\\\\\ \boxed{l=4\sqrt{2} \ cm}$