12.566 square units.
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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 .
A circle with a radius of 2 cm has an area of 12.57 square cm.
Area of circle = pi*(radius)2
The radius of the circle is 2 units. * * * * * If the area is 4 units, the radius is 1.128 units
Area of a circle = (pi) x (radius)2 (pi) = about 3.1416 or about 22/7 . (It can never be written down exactly.) (radius)2 = (radius) x (radius)