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= 2 . 22/7 . 7 . (7+21)
= 44 . 28
= 1.232 cm^2
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t = 21
dit : luas permukaan tabung
dij = 2πr(r+t)
= 2 × 22/7 × 7 (7+21)
= 44/7 × 7 × 28
= 1232 cm ²
jadi, luas permukaan tabung adalah 1.232 cm ²