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luas awal =Lo= phi ×r×r
= 22/7 ×14×14 = 616 cm2
luas keping setelah dipanaskan
= Lo (1+beta.perubahan suhu)
(beta = 2×£ besi
= 2×0,000012=0,000024)
=616 (1+0,000024×100)
=616 (1+0,0024) =616×1,0024
=617,4784 dibulatkan 617,5