Question

Aflati lunginea si latimea unui dreptunghi cu perimetrul de 76 cm decat: a) L=l+7cm

Answer 1

a) P=2xL +2x l
P=76cm
Semiperimetrul= l +L
l+L=76CM/2
 l +l +7cm=76cm/2
 2 l= 38 -7 cm
2 l=31cm
l=31cm :2
l=15,5cm
L=15,5cm+7cm
L=22,5
verificare
P=15,5+22,5+15,5+22,5=38+38=76
latimea=15,5 cm
lungimea=22,5 cm

Answer 2

P=76cm
L=l+7cm
P=2L+2l=2(L+l)=2(l+7+l)=2(2l+7)=4l+14
76=4l+14
4l=76-14
4l=62
l=62:4
l=15,5
L=15,5+7=22,5