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6280 .= 3,14 . 20² .t
6280 = 3,14 . 400 . t
6280 = 1256 . t
t =
t = 5 cm
L.selimut tabung = 2 .π . r . t
= 2 . 3,14 . 20 . 5
= 2 . 3,14 . 100
= 2 . 314
= 628 cm²