Question

aria unui dreptunghi este de doua ori mai mare decat aria unui patrat care are perimetrul de 36cm. aflati perimetrul dreptunghiului , daca una dintre laturile lui este 27 cm

Answer 1

$P_p=36 \\ P_p=4l \\\\ 4l=36 \ \ \ ===\ \textgreater \ \underline{l=9} \\\\ A_p=l^2=9^2\to 81 \\\\\\ A_d=2*A_p \\\\ A_d=2*81\to 162 \\\\\\ L=27 \\\\ A_d=L*l \\\\\\ 162=27*l \\\\ l=\frac{162}{27} \to 6 \\\\\\ P_d=2*L+2*l \\\\ P_d=2*27+2*6 \\\\ P_d=54+12 \\\\ \boxed{P_d=66}$