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3080 = 22/7 . 7 . 7 .t
3080 = 154t
t = 3080/154
t = 20
LP tabung = 2 phi . r (r+t)
Lp = 2 . 22/7 .7 (7+20)
Lp = 44 . 27
Lp = 1188
V= phi.r^2.t
3080=22/7. 7.7 .t
t= 20 cm
maka LP = 2.phi.r(r+t) = 2 . 22/7 . 7(7+20) =1188 cm^2