I think it is used once because it is no fair that one letter get to be used twice and the another letters are used once
Only one polygon has a name starting with the letter "a". It is called the "Apeirogon", and it is a polygon with infinite sides.
You use the same letter only once when naming a polygon (or parts of a polygon) to avoid ambiguity. If you have two line segments both labelled A, then you won't know which one you mean when you talk about segment A, right?
Because if you gave more than one side the same letter - it would get confusing !
Only if the polygon is a "regular" one.
No because a polygon is a shape that has 3 or more sides.
Ah, isn't that a delightful question! The block letter "h" is a polygon called a quadrilateral, specifically a rectangle. It has four sides and four right angles, just like a cozy little window frame. Just imagine all the happy little rectangles you can create with your letters!
A line?? It's impossible to have a polygon with only one side, hence the "poly" meaning many.
Trapezoid
Trapezoid
A trapezoid
I think regular. * * * * * Only if you ignore all the points where the sides cross one another.
Because polyhedron means 'many faces' - a polygon is a two-dimensional shape - it only has one face.