odd-looking.
triangle
The name of the angle which has three sided polygon called Triangle.
If a solid, it is called a "Polyhedron". If just lines in three dimensions, its called a "Three Dimensional Polygon". Polyhedron derives from Greek words for "many faced" or "many sided". Polygon derives from "many angles"
A three sided polygon is called a triangle; there is no other name for it.
A Polygon
There is no name because such a polygon does not exist. A polygon must have at least three sides.
A polygon is a two-dimensional shape. A cube has three dimensions, and is thus not a polygon.A three-dimensional solid shape (such as a cube) is called a polyhedron.
That is called a polygon.
That would be a polygon
That would be an equilateral triangle.
A face
A polygon.