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2310 = 22/7 x 7 x 7 x t
2310 = 22 x 7
2310 = 154
15 = t
L permukaan = 2 pi r(t+r)
= 2 x 22/7 x 7(15 + 7)
= 2 x 44 x 22
= 2 x 968
= 1936
maaf kalo salah