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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
maka jari-jari = r = 35 dm = 3,5 m
3850 dm² = 22/7 * r²
3850 dm² * 7 / 22 = r²
1225 dm² = r²
√1225 dm² = r
r = 35 dm
r = 3,5 m