A trapezoid
Trapezoid
A right angle triangle
well, for one thing, what polygon is it. a triangle, a quadrilateral, what!? Two, if its only side is 8in., then it is not a polygon at all. it needs to be a closed plane of connecting lines.
A polygon with four or more sides can meet all of the requirements.
If it is the outline of an arrow, and is made up of only straight lines, then it is a polygon. I tried to "draw" one, as an example, but the browser used at this site completely messed it up.
A trapezium
Because two straight lines cannot enclose a space - they can only cross at one point.
There isn't such thing as a one sided polygon. The definition of a polygon is a closed figure with straight lines. So technically it is just a line.
Answera polygon that has two right angles and one set of parallel lines is a hexagon
It must be a plane figure. It must be closed. It must be bounded by straight lines. These straight lines must not cross one another.
Four tests:Is it on a plane surface?Is it a closed shape: has it got an inside and an outside?Does the interior consist of only one area?Are all its borders straight lines?If all four answers are yes, then it is a polygon. If even one of them is no, it is not a polygon.
The star is a polygon, but not a simple one. It is not simple because parts of the lines forming its boundaries are inside the star. The outline of a star is a simple polygon.