Hisab ka tareeqa
Kaam se pehle mustateel kamra napein. Har simt kam karne wali deewarein ginein; do mukhalif deewarein aik hi paimaish do baar kam karti hain. Kul motai mein frame aur finish shamil karein. Konay do baar nahin gine jatay. Nami, energy bachat ya qanooni raqbay ki jaanch shamil nahin.
A₀ = L × W A₁ = (L − nL × tA / 100) × (W − nW × tA / 100) ΔA = A₀ − A₁ A₂ = (L − nL × tB / 100) × (W − nW × tB / 100)