A plenum is a meeting area where all participants are in attendance - as opposed to splitting off into small groups. Its size will depend on the number of people attending.
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surface area divided by volume
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
The surface area of a sphere = 4*pi*radius2
The same way you calculate the surface area of any other rectangle: Multiply the length of the wall by its height.
Area = Length * Breadth.