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Find the circumference of the circles with the following radius: (c) 21 cm

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

(c) $21\; cm$

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We know that

Circumference of circle is $= 2\pi r$

$\Rightarrow 2\pi r = 2 \times \frac{22}{7} \times 21 = 132 \ cm$

Therefore, circumference of circle is  132 cm

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