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616 = 1/4.22/7.d
616 = 22/28d²
d² = 616*28/22
d² = 784
d = √784
d = 28 cm
616 = r²
r² = 616 x
r² = 196
r = √196
r = 14
D = 2r
D = 2 x 14 = 28cm