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luas permukaan tabung = 2 π r(r+t)
188,4 = 2 x 3,14 x 3 x( 3 + t)
188,4= 18,84 x (3+ t)
3+ t = 188,4 : 18,84
3 + t = 10
t = 7 cm
2b.
volume tabung = π x r² x t
= 3,14 x 3² x 7
=197,82 cm³
4.
volume bola = 4/3 x π x r³
113,040 = 4/3 x 3,14 x r³
113,040 = 4,2 x r³
r³ = 113,040 : 4,2
= 26,9 = 27 (dibulatkan)
maka r = ∛27
r= 3 cm