Question

# Find circumference of a circle of diameter $$4.2\ cm$$.

A
13.2 cm
B
13.7 cm
C
14.2 cm
D
14.9 cm

Solution

## The correct option is A $$13.2\ cm$$Diameter of circle $$(d)=4.2\space\mathrm{cm}$$$$\Rightarrow$$ Radius of circle $$(r)=\dfrac{d}{2}=\dfrac{4.2}{2}=2.1\space\mathrm{cm}$$$$\therefore$$ Circumference of circle $$=2\pi r=2\times\dfrac{22}{7}\times2.1=13.2\space\mathrm{cm}$$So, $$\text{A}$$ is the correct option.Mathematics

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