Fie l = latimea si L = lungimea
l = [tex] \frac{L}{3} [/tex]
P = (l + L) · 2
P = ([tex] \frac{L}{3} [/tex] + L) · 2
Aducem la acelasi numitor:
P = [tex] \frac{4L}{3} [/tex] · 2
[tex] \frac{P}{2} [/tex] = [tex] \frac{4L}{3} [/tex]
160 cm = [tex] \frac{4L}{3} [/tex]
160 cm · 3 = 4L
L = [tex] \frac{480 cm}{4} [/tex]
L = 120 cm
Sper ca te ajuta!
