
Pentahedron
Not Just Pyramids
While a pyramid is a common pentahedron, not all pentahedra are pyramids. Explore other shapes too. 
3D Shape Context
'Pentahedron' refers specifically to a 3-dimensional shape, not a flat, 2D polygon. 
Faces Joining
A pentahedron's faces must join with others along edges to form a closed 3D shape. 