Question

calculati perimetrul unui dreptunghi care are latimea de 8cm,iar lungimea de 2ori mai mare

Answer 1

l = 8cm
L = 8x2 = 16 cm

P = 2l x 2L
P = 2x8 + 2x16 = 16+32 = 48 cm

Answer 2

$P=L+L+l+l \\ l=8 \ cm \\ L=2l \\ L=2*8 \ cm \\ L=16 \ cm \\ P=8 \ cm*2+16 \ cm*2 \\ P=16 \ cm+32 \ cm \\ \boxed{P=48 \ cm}.$