An irregular polygon
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
no
An irregular pentagon.
An irregular octagon.
an Irregular Polygon
A trapezium.
Any shape with 10 sides is called a decagon. A regular decagon is a shape with 10 even sides, so you are looking for an irregular decagon.
A shape with 7 sides is a heptagon
you call a two dimensional shape with six sides a hexagon
an four sided figure is called a quadrilateral.
It can be irregular too so it's a septagon
A shape with 8 sides is an octagon.