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phi = 22/7 atau 3,14
2.464 = 22/7 (phi) x r^2
17248 = 22 x r^2
784 = r^2
r = 28 cm
2464 = 22 / 7 r kuadrat
2464 = 22/7 kali r kuadrat
17248 = 22 r kuadrat
r kuadrat = 784
r = 28