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d=28cm ; r=14cm
ΔT=100°C
Alpha = 0,000012/°C
Beta = 2.Alpha = 2 . 12 . 10^{-6}
Dit : A akhir = At = ?
Penye :
A awal = Ao = = 22/7.14.14=616cm^{2}
ΔA=Ao.Beta.ΔT
= 616.12.10^{-6}.100=0,7392cm^{2}
At= Ao + ΔA = 616,7392 cm^{2}