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= 22/7 . 7²
= 22/7 . 49
= 154 cm²
Δt = 50°C
β = 2 . α
= 2 . 0,000012/°C
= 0,000024/°C
Ditanyakan : A₁ (Ao + ΔA)
Penyelesaian : ΔA = Ao . β . Δt
= 154 . 0,000024 . 50
= 0,1848 cm²
A₁ = Ao + ΔA
= 154 cm² + 0,1848 cm²
= 154,1848 cm²