Răspuns :
P=24 cm
L=l×5.
A=?
P=2×(L+l)
24=2×6l
l=24:12
l=2
L=2×5.
L=10
Aria=L×l
Aria=10×2=20 cm
L=l×5.
A=?
P=2×(L+l)
24=2×6l
l=24:12
l=2
L=2×5.
L=10
Aria=L×l
Aria=10×2=20 cm
P = 2(L + l)
24 = 2(L + l) | : 2
12 = L + l
L = 5 * l
12 = 5 * l + l
6 l = 12
l = 12 : 6
l = 2 cm
L = 5 * 2
L = 10 cm
24 = 2(L + l) | : 2
12 = L + l
L = 5 * l
12 = 5 * l + l
6 l = 12
l = 12 : 6
l = 2 cm
L = 5 * 2
L = 10 cm