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# Find the circumference of the circles with the following radius: (b) 28 mm

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

(b) $28\; mm$

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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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