Question 149

The area of a circle is 3850 square metres. What will be its circumference ?

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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