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8478 = 3,14. 15². t
8478 = 706,5 t
t = 12 cm
Vol tabung = 8.478cm³ + (1/4 * 8.478cm³)
= 10.597,5cm³
π r² t = Volume tabung
3,14 * 15² * t = 10.597,5cm³
706,5 *t = 10.597,5
t = 10.597,5 / 706,5 = 15cm