Răspuns :
l=12:4=3. Ad=L×l=12×3=36 Ap=Ad Lp=Ap:2=36:2=18. Pp=18×4= 72
L=12 cm
l=25% din L=25/100 *12=3cm, l=3 cm
A dreptunghi=L*l=12*3=36 cm patrati
P patrat=36 cm
l=25% din L=25/100 *12=3cm, l=3 cm
A dreptunghi=L*l=12*3=36 cm patrati
P patrat=36 cm