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19.
volume = r×r×r = 60cm × 60cm × 60cm = 216.000 cm3
volume yg belum terisi (perlu diisi agar penuh) = 3/4 × 216.000 cm3 = 162.000 cm3
19. 3/4 volume = 257.250cm3
volume = 4/3 × 257.250cm3 = 343.000cm3
rusuk = akar pangkat 3 dari 343.000cm3
rusuk = 70cm