Q. 1.     Find the circumference of the circles with the following radius: (Take \pi =\frac{22}{7} )

             (b) 28\; mm

Answers (1)

We know that 

Circumference  of circle is = 2\pi r

\Rightarrow 2\pi r = 2 \times \frac{22}{7} \times 28 = 176 \ mm

Therefore, the circumference of the circle is  176 mm

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