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1256 = 4 x 3.14 x r²
1256 = 12.56 r²
r² = 1256 : 12.56 r²
r² = 100
r = √100 = 10 cm
vol = 4/3 πr³
= 4/3 x 3.14 x 10³
= 4186.67 cm³