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- Pemuaian
Δt = 100 - 30 = 70 °C
Ao = 1 m²
α = 0,000012 /°C
ΔA = ___ ?
Perubahan luas akibat pemanasan
ΔA = Ao β Δt
= Ao · 2α · Δt
= 1 · 2 · 0,000012 · 70
= 0,00168 m² ← jawaban