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2464=3,14×r²
r²=2464/3,14
r²=784
r=√784
r=28 cm
jd jari jarinya adalah 28cm
2464 = 22/7 kli r pangkat 2
2464 kli 7/22 = r pangkat 2
17.248/22= r pngkat 2
784 = r pngkat 2
akar 784 = r
28 = r