Any 4 sided polygon is a quadrilateral. The square, rectangle, rhombus, trapezoid and parallelogram are special cases of the quadrilateral. Any other 4 sided polygon is an irregular quadrilateral.
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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.
It is a pentahedron. One example of an irregular pentahedron is the 4-sided pyramid.
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
a 4 sided shape is called a quadrilateral
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.