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Δt = t₁ - to
= 150 - 25
= 125°C
β = 2 . α
= 2 . 0,000017
= 0,000034/°C
Ditanyakan : A₁ (Ao + ΔA)
Penyelesaian : ΔA = β . Ao . Δt
= 0,000034 . 0,3 . 125
= 0,001275 m²
A₁ = Ao + ΔA
= 0,3 + 0,001275
= 0,301275 m²