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Luas lingkaran = π.
2464 =
2464(7) =
17248 =
= 17248/22
= 784
r =
r = 28 cm
2464 = 3,14 . r2
r2 = 2464 / 3,14
r2 = 784,713
r = akar dari 784,713
r = 28, 0128 cm