Solution
Area of circle = $$\pi r^2 = 3850$$
=> $$r^2 = \frac{3850 \times 7}{22} = 1225$$
=> $$r = \sqrt{1225} = 35$$ metre
$$\therefore$$ Circumference of circle = $$2 \pi r$$
= $$2 \times \frac{22}{7} \times 35$$
= $$10 \times 22 = 220$$ metres
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