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616=22/7 x r²
r²=616 x 7/22
r=√196
r=14
K=2πr
=2 x 22/7 x 14
=88 cm
616 x 7/22 = r^2
196 = r^2
r = 14
K = 2 x 22/7 x 14
K = 88
jawab b. 88 cm