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Δt = t₁ - to = 70°C - 20°C = 50°C
α = 0,000003
Ditanyakan : A₁ (Ao + ΔA)
Penyelesaian : ΔA = α² . Ao . Δt
= β . Ao . Δt
= 0,000003² . 55300 . 50
= 0,000009 . 55300 . 50
= 24,885 cm²
= 0,0024885 m²
A₁ = Ao + ΔA
= 5,53 m² + 0,0024885 m²
= 5,5324885 m²