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314 = 1/3 x 3.14 x r² x 12
314 x 3 = 3.14 x 12 x r²
942 = 37.68 r²
r² = 942 / 37.68
r² = 25
r = √25 = 5 cm
314 = 1/3 . 3,14 . r² . 12
314 = 12,56 r²
314/12,56 =r²
r = 5
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