quadrilateral
Get any 4 sided shape and vary all the sides to different lenghts and make it look weird-there you go an irregular 4 sided shape.
That can be true of a polygon with ANY number of sides. The only one with a particular name is a scalene triangle.
Because of different shape, that's why it has different name.
Scalene triangle.
Similar
Hexagon,octagon,nonagon,are a few figures with the same shape but may have a different size. * * * * * Two or more figures of the same shape but with different sizes are said to be similar.
A scalene triangle
The difference is in the shape, as can be guessed by the name.
You can name it or break it down
It can be hard learning and memorizing all the name of the different polygons. A 25 sided shape is called icosikaipentagon.
A hexagon has 6 sides. A cube has 6 faces.
Gronall is the name of a boomerang shape