a monogon or henagon
It's called a monogon. 2 sided shape is digon like semi=circle. Alright this is getting chaos.
henagon (or monogon) 1digon 2triangle (or trigon) 3quadrilateral (or tetragon) 4pentagon 5hexagon 6heptagon 7octagon 8enneagon (or nonagon) 9decagon 10hendecagon 11dodecagon 12
a 2 sided shape is real but a 1 sided shape is not
13
a monogon or henagon
henagon (or monogon)* * * * * A pentadecagon. But I prefer 15-gon since it is obvious what that means - without reference to a dictionary.
henagon (or monogon) 1digon 2triangle (or trigon) 3quadrilateral (or tetragon) 4pentagon 5hexagon 6heptagon 7octagon 8enneagon (or nonagon) 9decagon 10hendecagon 11dodecagon 12
a 2 sided shape is real but a 1 sided shape is not
13
There are many shapes that have fewer than 3 vertices like the circle, hyperbola, semi circle, and many others. However if you are only talking about polygons then there is no actual shape with fewer than 3 vertices that you can find in a real life situation but they do have names for these shapes. A 2-sided polygon is known as a digon. A 1-sided polygon is known as a monogon. These shapes only exist in theory however and not in real life.
Although a polygon is usually thought of as a two-dimensional figure with at least three sides, there is nothing in the definition of a polygon that prohibits its use for the classification of a one-sided figure. A one-sided figure is known as a henagon or a monogon. A polygon, by definition, has as many vertices as it has sides, so a single-sided polygon would have to, in order to meet that criterion, curve in on itself so that the two ends of the side meet to form a vertex. In order for the polygon to not be curved, it would have to be made up of two straight lines (this figure is known as a digon). So no, a polygon cannot be a single straight line.
Mean is the average.
The arithmetic mean is a weighted mean where each observation is given the same weight.
The correct usage is "what DOES it mean"
The haudensaunee mean irguios
No, but sometimes "average" means "mean" - when it doesn't mean median, geometric mean, or something else entirely.