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616=22/7
=616x7/22
=28x7
=196
r=
r=14 cm
diameter=2x14cm=28cm
616 = 22/7 . r²
616 x 7/22 = r²
28 x 7 = r²
196 = r²
r = √196
r = 14 cm
d = 2 x 14
d = 28 cm