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t = 10 cm
d = 14, maka r = 7
maka :
L prmukaan tabung =
L = 2 x π x r (r +t)
L = 2 x 22/7 x 7 (7+10)
L = 44/7 x 7 (17)
L = 44 x 17
L = 748 cm
nb : tdk ada di pilihan, tp hslnya 748
= 7 . 7 . 22/7 . 2 +(14. 22/7 . 10)
= 154 . 2 + (44 . 10)
= 308 + 440
=748 cm
maaf kalo salah^^