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To calculate the area of a circle use this formula: pi x r2.
A circle is two dimensional, it has area but not volume.
A simple formula to calculate the circumference of a circle: so in this case:
To calculate the are of a circle, use the formula area = pi x radius2.
The formula for the area of a circle is: Area = (pi) x (Radius)2 . When you know the radius of the circle and you use it to calculate the area of the circle, the result will be equal to (pi) x (Radius)2 .