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α = 9 . 10⁻⁶/°C = 0,000009/°C
Δt = 10°C
Ditanyakan = A₁ (Ao + ΔA)
Penyelesaian = ΔA = (2 . α) . Ao . Δt
= β . Ao . Δt
= (2 . 0,000009) . 1 . 10
= 0,000018 . 1 . 10
= 0,00018 m²
A₁ = Ao + ΔA
= 1 m² + 0,00018 m²
= 1,00018 m²