Respostas

2014-06-11T23:25:28-03:00
\Delta A = Ao . 2 .  \alpha  .(\Delta T)

\Delta A = 820 . 2 .  (0,000022)  .(50)=1,804 cm^2

Área Final =inicial + ΔA

Af = 820 +  1,804 = 821,804 cm²