irregular quadrilateral
A rectangle. Think about it.
A trapezoid is a 4 sided shape that has one pair of parallel sides of different lenghts
An isosceles trapezium.
A Scalene Triangle
parallelogram
scalene triangles
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.
All plane figures that have 3 sides are triangles (tri means 3). There are different triangles based on if all 3 sides are the same length, 2 sides the same, or none. If none are the same lengths, that Is a scalene triangle.
That can be true of a polygon with ANY number of sides. The only one with a particular name is a scalene triangle.
A shape with four sides is called a quadrilateral.
A shape with 12 sides is called a dodecagon.
any four sided figure is called quadrilateral