3D solid objects
Here are some common solid objects.
Prisms
A prism is a 3D object which has a constant cross section - both ends of the solid are the same shape and size and anywhere you cut parallel to these ends will give you the same idenitical shape.
For example, in the prism below, the cross section is a hexagon.
This is called a hexagonal prism.
Pyramids
A pyramid is a 3D object that has sloping A plane surface of a geometric solid. A cube has 6 faces; a tetrahedron, 4 faces. that meet at a The point where two lines meet is called the vertex. In a 3D shape this is the corner point..
Cross sections of a pyramid are similar - always the same shape but different sizes.
Square-based pyramid
Tetrahedron