Area of a circle = pi*radius2 in square units
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pi times the radius squared pi r squared
(pi times radius squared) plus (pi times radius times slant).
That is correct because the surface area of a sphere is: 4*pi*radius squared
A= Area of the circle¶= Pi (About 3.14)r= Radius squared (Radius times radius)3.14 * Radius squared
perimeter (circumference): diameter times pi (3.14) area: radius times radius times pi (3.14) Area = pi*radius squared Circumference = 2*pi*radius or pi*diameter