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3850=22/7 x r²
r²=3850 : 22/7
r²=25
r=√25
r=5
diameter= 10
3.850 cm² = 22/7 x r²
r² = 3.850/22/7
r² = 3.850 x 7/22
r² = 1225
r = 35
diameter = 2.r
= 2.35
= 70