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3,14 x 23^2 x t = 1173
1661,06 x t = 1173
t = 1173/1661,06
= 0,7 cm
luas permukaan = 2 x phi x r (r+t)
= 2 x 3,14 x 23 (23+0,7)
= 144,44(23,7)
= 3423,228 cm^2