Shape and Space
3D Shapes  Terminology
A 3D shape is a geometric figure that has three dimensions, width, depth and height. 3D shapes differ from 2D shapes because they have thickness.
They are often thought of a solids, but can also be hollow, like an empty box.
We classify 3D shapes by the number and size of their faces, the number of their vertices, and by the number and size of their edges.
Faces  these are the flat parts of the 3D shape.
Edges  these are the sides of the faces, where two faces meet.
Vertices  These are the corners or points of the shape.
3D shapes can be divided into two main types:
Polyhedra  are shapes that have flat faces. Cuboids, Prisms and Pyramids.
NonPolyhedra  If any of the faces are not flat. Spheres, Cylinders and Cones.
The word 'Polyhedron' comes from the Greek  'poly' meaning 'many' and 'hedra' meaning 'faces'  many faces. (Polyhedra is the plural of Polyhedron) 
Cube
6 Faces  all squares
12 Edges
8 Vertices 

Cuboid
6 Faces  all angles are 90° and rectangles
12 Edges
8 Vertices 

Cone
1 flat Face (the base) which is a circle.
1 curved Face.
1 Vertex (often called the apex)
1 Edge 

Cylinder
2 flat Faces (top and bottom) both are circles
1 curved Face
2 Edges
No Vertices


Sphere
1 curved Face
no Vertices
no Edges 

Triangular Prism
6 Vertices
5 Faces  2 triangles and 3 rectangles
9 Edges


Regular Tetrahedron
4 Faces  all are triangles
4 Vertices
6 Edges
(also known as a TriangleBased Pyramid) 

SquareBased Pyramid
5 Faces  the base is a square, the sides are triangles
5 Vertices
8 Edges 


