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1.256 = 1/3 x 3,14 x r² x 12
1.256 = 12,56 x r²
r² = 1.256/12,56
r² = 100
r = 10cm
1256= ⅓×3,14×r²×12
1256= 12,56×r²
r²= 1256÷12,56=100
r=√100
r=10 cm