Question

Un dreptunghi are perimetru 54,36m. Det. aria dreptunghiului , stiind ca are lungimea de 8ori mai mare decat latimea"

Answer 1

$P = 54.36 \: m$

$P = 2(L + l)$

$L = 2l$

$2(2l + l) = 54.36 \: | \div 2$

$2l + l = 27.18$

$3l = 27.18 \: | \div 3$

$l = 9.06 \: m$

$L = 2l$

$L = 2 \times 9.06$

$L = 18.12 \: m$

$A=L \times l$

$A=18.12 \times 9.06$

$A=164.1672 \: {m}^{2}$