Răspuns :

P=l+l+L+L=180
2l+2L=180 /:2
l+L=90
L=2l
2l+l=90
3l=90
l=90:3
l=30

L=2*30
L=60

perimetrul= 180
suma=perimetrul/2
suma=180:2
suma=90
x+2x=90
3x=90
x=30(latimea)
30x2=60(lungimea)