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2464 = 22/7 x r²
r² = 2464 : 22/7
r² = 2464 x 7/22
r² = 784
r = √784 = 28
keliling = π x d
= 22/7 x 56
=176 cm
∴ jari-jari = 28 cm dan kelilingnya = 176 cm