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 triangle with all three sides of different lengths is called a scalene triangle. In this type of triangle, not only are the sides different, but the angles are also all distinct. This differentiates it from other types of triangles, such as isosceles and equilateral triangles, which have equal side lengths.
A scalene triangle
The difference is in the shape, as can be guessed by the name.
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.