[tex]A _{patrat} = l ^{2} \\ A_{patrat} = (15cm)^{2} \\ A_{patrat}=225 cm ^{2} \\ A_{patrat}= A _{dreptunghi} . \\ A _{dreptunghi}= 225 cm ^{2} \\ A _{dreptunghi}= L*l= 25cm*l. \\
225cm ^{2} = 25 cm *l \\ l= \frac{225 cm ^{2} }{25 cm} \\ l=9cm. \\ P_{dreptunghi}= (L+l)*2 \\ P_{dreptunghi}= (25+9)*2= 34*2 \\
\boxed {P = 68 cm}.[/tex]
