Răspuns :
4*Lpatrat=2(Ldreptunghi+l dreptunghi)
Ldreptunghi=20cm
l dreptunghi=20:2=10cm
4*Lpatrat=2(20+10)
4*Lpatrat=2*30
4*Lpatrat=60
Lpatrat=60:4 => Lpatrat=15 cm
Baftaaa!!!
Ldreptunghi=20cm
l dreptunghi=20:2=10cm
4*Lpatrat=2(20+10)
4*Lpatrat=2*30
4*Lpatrat=60
Lpatrat=60:4 => Lpatrat=15 cm
Baftaaa!!!
Ppatrat=Pdreptunghi
Pd=L+L+l+l
L=20 cm
l=20:2=10 cm
Pd=20+20+10+10
Pd=60 cm
Ppatrat=l+l+l+l=60 cm
1 patrat=4 laturi egale
60:4=15 cm este o latura
Pd=L+L+l+l
L=20 cm
l=20:2=10 cm
Pd=20+20+10+10
Pd=60 cm
Ppatrat=l+l+l+l=60 cm
1 patrat=4 laturi egale
60:4=15 cm este o latura