Question 67

The area of a circle is 616 sq cm, ﬁnd its circumference?

Solution

Let the radius of circle = $$r$$ cm

Area of circle = $$\pi r^2 = 616$$

=> $$\frac{22}{7} \times (r)^2 = 616$$

=> $$(r)^2 = \frac{616 \times 7}{22} = 196$$

=> $$r = \sqrt{196} = 14$$ cm

$$\therefore$$ Circumference of circle = $$2 \pi r$$

= $$2 \times \frac{22}{7} \times 14$$

= $$44 \times 2 = 88$$ cm

=> Ans - (B)

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