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Ls = 628 cm^2
r = 10 cm
t = ?
Ls = 2 .π.r .t
628 = 2.3,14 . 10 .t
628 = 62,8 .t
t = 628 / 62,8
t = 10 cm
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2πrt = 628
2(3,14)(10)t = 628
62,8 t = 628
t = 628/62,8
t = 10 cm