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Lbola = 4πr^2
1256 = 4 x 3,14 x r^2
1256/4 = 3,14r^2
r = √314/3,14
r = √100
r = 10 cm,,
rBola = rTabung
Ltbung = 2πr (r + t)
= 2 x 3,14 x 10 (10 + 2r)
(tTabung = dBola)
= 62,8 (10 + 2 x 10)
= 62,8 (30)
= 1884 cm2,,