Take out the diameter of the outer circle from the distance between the two.
Gives you the diameter of the inner circle then pi r squared it.
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Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
To calculate the area of a circle use this formula: pi x r2.
Area of a sector of a circle.
the area of the circle is Pi X Radius squared
A circle is two dimensional, it has area but not volume.