Surface area of a circle = pi*radius2
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A circle doesn't have a surface area because it is a 2D object. The area of a circle is = pi r2. if you mean the surface area of a sphere it is = 4 pi r2
Area of a circle = pi*radius2
the area of the circle is Pi X Radius squared
A flat round object is a circle. Surface area of a circle = pi*radius squared.
surface area is the area of a 3D object radius is half of the diameter of a circle