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They are: 2*pi*radius or as diameter*pi
C= 2 times pi and C= pi times diameter C= 2 times pi and C= pi times diameter
Area of a circle: pi*radius^2 Circumference of a circle: 2*pi*radius or diameter*pi Surface area of a sphere: 4*pi*radius^2
C = 2*pi*rC = pi * dwhere d = diameter and r = radiusSince d = 2r by definition, the formulas are equivilent
Area of a circle: pi*radius^2 Circumference of a circle: 2*pi*radius or diameter*pi Volume of a sphere: 4/3*pi*radius^3 Surface area of a sphere: 4*pi*radius^2