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maaf klo salah
1256 = 3,14 x r²
r² = 1256/3,14
r² = 400
r = √400
r = 20
keliling lingkaran = π x d
d = r x 2
d = 20 x 2
d = 40
keliling = 3,14 x 40
keliling = 125,6cm