Find the circumference of the circles with the following radius: $(Take\ \pi=\frac{22}{7})$
$(a)$ 14 cm $(b)$ 28 mm $(c)$ 21 cm

$(a)$. Radius$(r)=14\ cm$

Circumference$=2\pi r=2\times\frac{22}{7}\times14$

$=88\ cm$

$(b)$. Radius$(r)=28\ mm$

Circumference$=2\pi r=2\times\frac{22}{7}\times28$

$=176\ mm$

$(c)$.Radius$(r)=21\ cm$

Circumference$=2\pi r=2\times\frac{22}{7}\times21$

$=132\ cm$

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Updated on: 10-Oct-2022

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