Question

Calculeaza aria unei gradini de forma dreptunghiulara, care are latimea de 3 ori mai mica decat lungimea, iar perimetrul de 240 m.

Answer 1

l = L:3 => L = 3×l
P = 2×(L+l) = 240
2×( 3×l+l) = 240
6×l + 2×l = 240
8×l = 240
l = 240:8
l = 30 (latimea)
L = 3×30 = 90 (lungimea)

Aria = L × l = 90×30 = 2 700 m^2

Answer 2

L|---|---|---| Total 240
L|---|---|---|
l|---|
l|---|
240:8=30
L=30×3=90
l=30
Aria=90×30=2700