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616 = 4πr²t/3
616 = 4πr² x 12/3
616 = 4πr²x 4
πr² = 616/16
πr² = 38,5
r² = 38,5/22 x 7
r² = 12,25
r = √12,25
r = 3,5 cm
d = A = 2 x 3,5 = 7 cm