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Calculation of Area of Annulus

Annulus can be defined as the area of the ring-shaped space between two concentric circles that define it.

The area of Annulus can be derived by using the formula mentioned underneath:

         where:
                                          R is the radius of the outer circle
                                          H  is the radius of the inner 'hole'
                                          π  is Pi, approximately 3.142

This simplifies a little to:

 
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