## Area of circular ring

The area between two coplanar concentric circles. A flat ring-shaped object,is called the area of circular ring.The outer and inner circles that define the ring are concentric.The area of the circular ring can be found by subtracting the area of the hole from the area of the overall disk.

## $$\Pi [{w}^{2}-{r}^{2}]$$

Here,r=average radius,w=width of ring

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