[tex]\displaystyle\bf\\L_1=Latura~primului~patratului\\ P_1=perimetrul~primului~patratului\\L_2=\textbf{Latura celui de-al doilea patrat}\\P_2=\textbf{perimetrul celui de-al doilea patrat}\\\\P_1=4L_1\\ P_1-108=2L_1\\4L_1-108=2L\\ 4L_1-2L_1=108\\ 2L_1=108\\\\ L_1= \frac{108}{2}=54~cm\\\\ \implies P_1=4L_1=4\times54=216 cm\\\\\\L_2=3\times L_1+15\\\\L_2=3\times54+15\\\\L_2=162+15\\\\L_2=177~cm\\\\P_2 = 4L_2\\\\P_2=4\times177\\\\ \boxed{\bf~P_2=708~cm}[/tex]