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1884 = 1/3 × 3,14 × r² × 8
1884 / (1/3) = 3,14 × r² × 8
1884 × 3 = 3,14 × r² × 8
5652 / 8 = 3,14 × r²
706.5 = 3,14 r²
706.5 / 3,14 = r²
r² = 225
r =√225
r = 15 Dm