Question

Calculati aria unui dreptunghi care are lungimea de 7 metri si perimetrul de 22 metri.

Answer 1

$\rm L=7~m \\ P=22~m \\ 2(L+l)=22 \\ 2(7+l)=22 \\ 7+l=11 \\ \bold{l=4~m} \\ A=L\cdot l \\ A=7 \cdot 4 \\ \bold{\underline{A=28~m^2}}$