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t = 2r
320 phi = phi x 2 x r x t + phi x r^2
320 phi = phi x r (2t +r)
320 = r (2x2r + r)
320 = r (4r + r)
320 = 5r^2
64 cm = r^2
8 cm = r
V = phi x 8 x 8 x 2 x 8
= 1024 phi cm3