Area of a circle = pi*r2
Area = pi(12 in)2
( 144 * pi )
= 452 in2
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9pi
Area = (pi) (radius)2 = 225 pi = 706.858 square centimeters (rounded)
Because the circle is measured in square units.
pi times radius squared: a=pi x r2
The radius is the distance from the centre point to the edge.