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616= 22/7 rkuadrat
616 . 7/22 = r kuadrat
196= r kuadrat
akar 196 = r
14 = r
r^2 = luas : phi
r^2 = 616 : 22/7
r^2 = 616 x 7/22
r^2 = 196
r = V196
r = 14 cm