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231*7=22r²*6
1617=22r²*6
1617=132r²
132r²=1617
r²=12.25
r =√12.25
r=3.5
231= 3,14×r²×6
231= 18,84 r²
r²= 231÷18,84
r=√12,26
r= 3,5 cm