Question 22

The area of a circle is 346.5 cm2. Find its circumference (in cm).

Solution

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

=> Area = $$\pi r^2=346.5$$

=> $$\frac{22}{7}\times r^2=346.5$$

=> $$r^2=346.5\times\frac{7}{22}=110.25$$

=> $$r=\sqrt{110.25}=10.5$$ cm

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

= $$2\times\frac{22}{7}\times10.5$$

= $$44\times1.5=66$$ cm

=> Ans - (C)

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