Question

What is circumference of each circle given the diameter(d) or radius(r) d = 3 cm

Answer 1

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provide the figure / Diagram for understand which type of circle given......

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$\rightarrow \: 2 \pi r \\ \\ 2 \times \frac{22}{7} \times \frac{d}{2} .$

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Answer 2

when diameter = 3 cm

Diameter= 3cm

$radius \: \\ = \dfrac{3}{2}cm$

Circumference $= 2\pi \: r \\ = 2 \times \dfrac{22}{7} \times \dfrac{3}{2} \\ = \dfrac{3 \times 22}{7} \\ = \dfrac{66}{7} \\ = 9.4cm$

${\bold{\underline{\red{Circumference\:=9.4cm}}}}$