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kalo gitu caranya begini....
L selimut tabung = 2 r x t
126cm2 = 2 x r x 10,5
126 = 21 r
r =
r = 6
L permukaan tabung = 2 r (r+t)
L permukaan tabung = 2 6 (6+10,5)
L permukaan tabung = 12 (16,5)
L permukaan tabung = 198 cm2