L=34cm
l=26cm
P=2x{L+l}
P=2x{34+26}=2x60=120cm
l=42cm
L=42+16=58
P=2x{L+l}=2x{58+42}=2x100=200cm
L=60
l=60:3=20cm
P=2X{60+20}=2X80=160cm
l=2dm=20cm
L=20cmx5=100cm
P=2X{100+20}=2X120=240cm
P=120cm+200cm+160cm+240cm=720cm
perimetrul patratului=4xl
=720cm:4
l= 180cm este latura unui patrat