Area of a circle = pi*r2
Circumference of a circle = 2*pi*r or pi*d
Volume of a sphere = 4/3*pi*r3
Surface area of a sphere = 4*pi*r2
Volume of a cone = 1/3*pi*r2*height
Volume of a cylinder = pi*r2*height
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To convert from degrees to radians, multiply the number of degrees by (pi / 180). Pi is approximately 3.1416.
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
Pi = circumference/diameter
They are: 2*pi*radius or as diameter*pi
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