What is the area between two concentric circles?

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Solution

Concentric circle:
Concentric circles are circles with a common center.
The area between two concentric circles is known as the circular ring. It is also known as the annulus.
If the radius of the small circle is $r$ and the radius of the large circle is $R$ , then
Hence, the area of an annulus $= π (R^{2} - r^{2})$ sq. units.

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