Solution :
We need to calculate the radius.
We know that :
Here,
Substituting values :
> 616 = (22/7) × r^2
> 616 = 22r^2 / 7
> 616 × 7 = 22r^2
> 22r^2 = 4312
> r^2 = 4312 / 22
> r^2 = 2156 / 11
> r^2 = 196
> r = 14
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