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2464 = 22/7.r.r
r^2 = 2464 : 22/7
r^2 = 784
r = √784
r = 28
d = 28x2
d = 56cm
Kenapa phi = 22/7 karena 2464 bisa dibagi dengan angka 7 pasti r kelipatan 7 pastinya jadi gunakan 22/7
Semoga bermanfaat :D