Question

Diameter=21cm,Radius=?, Circumference=?

Answer 1

Answer:

$diameter = 21 cm \: \\ radius = \frac{21}{2}cm \\ circumference = 2 \times \pi \times r \\ = 2 \times \frac{22}{7} \times \frac{21}{2} \\ = 22 \times 3 \\ = 66cm$

Step-by-step explanation:

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