It depends on what information you have about the shape.
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it is length x width of a four sided shape
A one sided shape
A=(5t2 tan(54o) )/ 4
Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.
a six sided shape is a hexagon