Răspuns:
Explicație pas cu pas:
8a)
l1=12,5 cm
l2=10,5 cm
P=4l
P1=4l1 si P2=4l2
P1/P2=l1/l2=12,5/10,5=125/105=25/21=R
A=l²
A1/A2=l1²/l2²=R²=625/441
b)l1=6/5cm l2=18/5cm R=l1/l2=6/5×5/18=1/3
P1/P2=R=1/3
A1/A2=R²=1/9
9 daca R=L1/L2=7/2 ⇒P1/P2=R=7/2
A1/A2=R²=49/4
