hexagon
quadrilateral
quadrilateral
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
There cannot be a solid three sided figure. A solid 4 sided object is a tetrahedron.
pyramid
hexagon
Pyramid :P
What's wrong with pentahedron?
a quadrilateral
A four sided shape
quadrilateral
quadrilateral
34-gon
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
Since I don't have the vaguest idea what it is, I would not call it anything!
There cannot be a solid three sided figure. A solid 4 sided object is a tetrahedron.