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r^2 = luas/
r^2 = 2464 / 22/7
= 2464x 7/22
=784
r^2 = 784
r= √784= 28
2464=22/7xrxr
(2464x7)/22=rxr
17248/22=rxr
784=r2
akar 784=r
28 cm=r