It's perfectly acceptable to call it a an 80-agon but what's more important is knowing how to work out its properties.
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the logical answer is your face
A polygon with 6 sides is a hexagon and a polygon with 8 sides is an octagon
No the sides of a polygon can not cross
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
A polygon with 3 sides is a triangle.