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616=22/7 x r^2
4312=1/7 x r^2
196= r^2
√196= r
r=14
K= 22/7 x d
K=22/7 x 28
K= 88 cm
616 = 22/7 × r² = 22/7 × 14
r² = 616 ÷ 22/7 = 44 cm
r² = 196
r = √196 = 14