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2464=22/7.r²
r²=2464.7/22
r²=784
r=28
d=2.r
2.28
=56cm
22/7 · r² = 2464
r² = 2464 × 7/22
r² = 784
r = √784 = 28 cm,
jadi d =2r = 2(28) = 56 cm