### Bases

Every prism has two congruent faces, its bases, which lie in parallel plans. The line segments that connect the corresponding vertices of these faces are parallel to each other.

### Prism

A solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.

### Right Prism

If the lateral edges of a prism are perpendicular to the planes of its bases, it is a right prism

### Oblique Prism

If the lateral edges of a prism are oblique to the planes of its bases, the prism is an oblique prism

### Net

In geometry the net of a polyhedron is an arrangement of edge-joined polygons in the plane which can be folded (along edges) to become the faces of the polyhedron.

### Altitude

An altitude of a prism is a line segment that connects the planes of its bases and that is perpendicular to both of them.

### Postulate 13

Consider two geometric solids and a plane. If every plane parallel to this plane that intersects one of the solids also intersects the other so that the resulting cross sections have equal areas, then the two solids have equal volumes.

### Corollary 1 to Postulate 14

The volume of a rectangular solid is the product of its length, width and height: V=lwh