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308 = 2 x 22/7 x r
308 = 44r/7
2156 = 44r
r = 49cm
diameter = 2 x r
2 x 49 = 98
πD = 308cm
D = 308 / π
D = 308 : 22/7
D = 308 x 7/22
D = 98cm