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L.alas = phi x r x r = 3,14 x 0,7 x 0,7 = 1,5386 m²
Volume tabung = Luas alas x tinggi = 1,5386 m² x 3 m = 4,6158 m³
4,6158 m³ = 4615,8 dm³
4615,8 dm³ : 15 dm³ = 307,72 menit = 308 menit