A prism is a Polyèdre consisted by two superposable polygonal bases located in two parallel plans and Parallélogramme S uniting the bases.

A right (d) of constant direction moving along a Polygon (p) described a surface called prismatic surface of directing polygon (p) and of generating (d). A prism is the solid delimited by this surface and two parallel plans. The sections defined by the two parallel plans are called the bases of the prism. The distance separating the two bases is called height prism.

When the plan is perpendicular to the generating right-hand side (d), the prism is called right prism . When the prism is right, the side faces are Rectangle S.

Examples of right prisms:

• the Cubic: all the faces are Carré S.
• the right-angled parallelepiped (paving stone): all the faces are rectangles.
• the right prism at triangular base (for example, the chocolate box of mark Toblerone).

Other examples of prisms:

• the unspecified Parallelepiped: the faces are Parallélogramme S.
• the Rhomboèdre: the faces are Losange S equal.

The Volume of a prism is worth the product V = S × H where S indicates the surface of one of the two bases (they have even surface) and H the height of the prism.

The side surface of a right prism is worth the product p × H perimeter multiplied by its height.