They are 3 dimensional objects such a s polyhedrons.
Polyhedra are 3-dimensional shapes bounded by polygons. Polygons are flat [plane] shapes bounded by straight lines. So a polyhedron cannot have any curved faces.
They are both 3 dimensional shapes with faces that are polygons.
all regular polygons
Yes. Parallelograms are flat shapes (polygons). 3-dimensional forms are polyhedrons.
They can be 2 dimensional shaped polygons or 3 dimensional shaped polyhedrons in algebraic geometry
All of the polygons because they don't have depth
They are closed 2 dimensional shapes whose sides are all straight lines. They can have 3 or more sides.
Most 2 dimensional shapes (all polygons) have 3 or more vertices. Most 3-dimensional shapes (polyhedra) have 4 or more vertices.
They are both simply connected 3-dimensional shapes, all of whose faces are polygons.
Shapes that have length, width and depth are considered to be 3 dimensional