Area=pi times radius squared
Circumference=pi times diameter or pi times radius times two
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Using 3.14 as Pi the area of circle is: 0
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
circumference = 2*pi*radius or pi*diameter
Because of the radius of the circle
Radius = square root of (area/pi) Circumference = 2*pi*radius