[tex]P_{dreptunghiului}=640m; L - lungimea; l - latimea
\\ L = \frac{3}{8}640 =\ \textgreater \ L=127,5(m);
\\ 2(L+l)=640 =\ \textgreater \ l=320-L =\ \textgreater \ l=320-127,5 =\ \textgreater \ l=192,5(m)
\\A _{dreptunghiului} - ?
\\ Rezolvare:
\\ A_{drept.} = L * l = 127,5 * 192,5=24543,75( m^{3})
[/tex]
