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.
The difference is in the shape, as can be guessed by the name.
A scalene triangle
You can name it or break it down
A hexagon has 6 sides. A cube has 6 faces.
A symmetrical shape. There are many different shapes that have one or more lines of symmetry and there is no other name associated with them as a group.
Gronall is the name of a boomerang shape