A four-sided solid is called a tetrahedron.
If all sides are equal, it is a cube.
A tetrahedron.
hexagon
quadrilateral
quadrilateral
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
It is a square or a rhombus
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.
It is a square or a rhombus
There cannot be a solid three sided figure. A solid 4 sided object is a tetrahedron.