# Annulus Calculator

An Annulus is a ring shaped object (the area between two concentric circles)

Enter the dimensions of the outer and inner circles to calculate the annulus.

There is an option to create a PDF document from the details entered

### This calculator includes the following algorithms

*Diameter is the Radius x 2*

*Radius is the Diameter x 0.5*

*Circumference is PI x Diameter*

*Area is 2 x PI x Radius*

*PI is 3.141592654 (to 9 decimal places)*

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