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314 = 1/3 3,14 x r^2 x 12
314 = 3,14 x r^2 x 4
314 = 12,56 x r^2
r^2 = 25
r = 5
jadi jari- jari lingkaran adalah 5 cm
314 = 3,14.r kuadrat. 1/3 . 12
r kuadrat = 314 . 3/ 3,14 . 12
r kuadrat =25
r = pangkat 25
r =5