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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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