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r = 1/2 d
= 1/2 X 6
= 3 cm
V = πr²t
= 22/7 X 3² X 21
= 22 X 9 X 3
= 22 X 27
= 594 cm³
Waktu yg diperlukan
= 594/2
= 297 menit
= 4 jam 57 menit
Maaf, kalau salah..
Semoga bermanfaat.. :) !!