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2464 cm² = 22/7 x r²
r² = 2464 : 22/7
r² = 2464 x 7/22
r² = 784 cm
r =√784 = 28 cm
d= 28 x 2 = 56 cm
keliling lingkaran = π x d = 22/7 x 56 = 176 cm