Circumference of a circle = 2*pi*radius or pi*diameter
Area of a circle = pi*radius2
Volume of a sphere = 4/3*pi*radius3
Surface area of a sphere = 4*pi*radius2
Total surface area of a cylinder = (2*pi*radius2)+(2*pi*radius*height)
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Area of a circle: pi*radius2 Circumference of a circle: 2*pi*radius or diamerer*pi Surface area of a sphere: 4*pi*radius2 Volume of a sphere: 4/3*pi*radius3 Volume of a cylinder: pi*radius2*height
Pi = circumference/diameter
Pi to five decimal places is 3.14159.
They are: 2*pi*radius or as diameter*pi
There are thousands of formulae which use pi:Circumference of circle = 2*pi*radiusArea of circle = pi*r^2Area of ellipse = pi*semiaxis1*semiaxis2Surface area of sphere = 4*pi*r^2Volume of sphere = 4/3*pi*r^3pi also appears in some of the most common statistical distributions: the Gaussian (or Normal) as well as Student's t-distribution.