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= π.r².t
18.480 = 3,14 x r² x 30cm
r² =
r² = 196
r = √196
= 14cm
Luas selimut tabung
= 2 π r t
= 2 x x 14 x 30
= 44 x 2 x 30
= 2640 cm² E ⇔⇔⇔⇔ jawaban