Depends on what you know. Like if you know the radius, square it and multiply it by pi. If you know the diameter, do the same thing as you do with the radius except do it after finding half of that diameter.
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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.
the area of the circle is Pi X Radius squared
A circle is two dimensional, it has area but not volume.
To calculate the are of a circle, use the formula area = pi x radius2.