Tolong dijawab , besok dikumpul

v1 = phi x r x r x t
= 22/7 x 7 x7 x10
= 1540 cm^3

v2 = phi x r x r x t
= 22/7 x 28 x 28 x 30
= 73920 cm^3

v gab = 1540 + 73.920
= 75460 cm^3 (c)