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3850 = 22/7 x r^2
3850 x 7 = 22 x r^2
26950 = 22 x r^2
26950 : 22 = r^2
1225 = r^2
r= akar 1225
r= 35cm
3850 = × r × r
r × r = 3850 ÷
r × r = 3850 ×
r × r = 175 × 7
r × r = 1225
r = √1225
r = 35 cm