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a. T.tabung = 7 cm.
Luas permukaan tabung = 2πr(r+t)
188,4 = 2 × 3,14 × 3 × ( 3 + t)
188,4 = 18,84 × ( 3 + t )
3+t = 10 , t = 7 cm.
b. Volume tabung = 197,82 cm³
Volume tabung = πr²t
= 3,14 × 3 × 3 × 7 = 197,82 cm³.