The area of a circle of radius r is pi*r*r
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Area of a circle is pi r^2 diameter is twice the radius. 3.14*8*8=64*pi or approximately 200.96
A circle with a radius of 5 units has an area of 78.54 square units.
A=pi times R squared If the radius is 5, the area is 25pi
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Area = circumference squared... You do circumference divided by 4,... and then divide that by Pi.