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ΔA=(50cm×30cm)(0,000012/"C)(100"C-20"C)
ΔA=(150cm²)(0,000012/"C)(80"C)
ΔA=0,144cm²
= 1500cm ( 1+ 2 x 0,000012 x 100)
= 15m( 1 + 0,0024)
= 15m ( 1,0024)
= 15,036m
pertambahan
L2 -L1
15,036 m - 15 m= 0,036 m