Explicație pas cu pas:
Cum se afla perimetrul unui dreptunghi?
Formula:2(L+l)
1)L=23cm
l=15cm
Pdreptunghi=2(23cm+15cm)
=2*38cm
=76cm
2)L=12dm
l=8dm
Pdreptunghi=2(12dm+8dm)
=2*20dm
=40dm
3)L=5dm6cm = 50cm+6cm=56cm
l=2dm4cm=20cm+4cm=24cm
Pdreptunghi=2(56cm+24cm)
=2*80cm
=160cm
4)L=1m4dm=10dm+4dm=14dm
l=1m4cm=100cm+4cm=104cm=10,4dm
Pdreptunghi=2(14dm+10,4dm)
=2*24,4dm
=48.8dm
