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1848 = 22/7 x r² x 12
1848/12 = 22/7 x r²
154 = 22/7 x r²
r² = 154 x 7/22
r² = 1078/22
r² = 49
r = √49
r = 7 dm
1848 = π r² * 12
1848/12 = π r²
154 = 22/7 * r²
154*7/22 = r²
49 = r²
r = 7