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Question

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


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