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Circumference of a Circle

What is the a...

Question

What is the area between the $2$ concentric circles?

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Solution

Area of a circular ring $= π (R^{2} - r^{2})$
$= 3.14 (4^{2} - 2^{2})$
$= 3.14 \times 12$
$= 37.68$ $c m^{2}$

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