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1256 = 4 x 3.14 x r²
1256 = 12.56 x r²
1256/12.56 = r²
√100 = r²
10 = r
Vbola = 4/3 x phi x r²
= 4/3 x 3,14 x 10 x 10 x 10
= 12.560 / 3
= 4.186,67