if the area given is 100 square inches you can use 10" by 10" duct
due to a black art known as aerodynamics or compressible fluid flow,
you will get the same back pressure in a 10" diameter round duct
and a 2" x 50" duct considerably more back pressure
a nice manufactured 90 will take as much back pressure as 50' of duct
a tight curved 90 will take as much as 100 feet of duct
fans have a curve that goes from maximum cfm at no pressure
to minimum cfm at max pressure
the fan will require the most power when cfm * pressure is highest
simple as rocket science i guess
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You cannot "calculate" the front of a box. You can calculate its dmensions, or its area but calculating it does not make sense. As for calculating its size or area, the answer will depend on what information you have and what you require.
that depends on what size your duct is as it will vary depending on duct size
If you're only given the base, then you can't calculate the other leg. If you have any one of the following, then you can calculate all of the parts of the triangle: -- length of the other leg -- length of the hypotenuse -- size of either acute angle
How to calculate spanner size regarding bolts and nuts
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.