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r² = V / pi . t
r² = 770000 / 22/7 . 20
r² = 770000 . 7/22 . 20
r² = 770000 . 7/1,1
r² = 700000 .7
r² = 4900000
r = √4900000
r = 700000
d = 2r
d = 1400000