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3.850 = 22/7 x r²
3.850 : 22/7 = r²
3.850 x 7/22 = r²
1225 = r²
√1225 = r
35 = r
r = jari-jari = 35 cm
π x r² = 3850
r² = 3850 x π
r² = 3850 x 7/22
r² = 1225
r = √1225
r = 35 cm