[tex]\displaystyle\it\\L=3l,~dar~suprafatata~dreptunghiulara~a~cartii~este~de~1323m^2 \implies\\\mathcal{A}=L\cdot l=3l^2 \implies l^2=441 \implies \boxed{\it l=21m,~iar~L=63m.}~.\\P_{carte}=2(L+l)=2(21+63)=168m.\\asadar,~colacul~de~sarma~are~168\cdot4=672m.[/tex]
