If a plane intersects all edges of a pyramid, parallel to its bases, it divides the solid into two others: a new pyramid and a pyramid trunk. Given the following regular pyramid trunk, we have:

the bases are parallel and similar regular polygons;

the lateral faces are congruent isosceles trapezoids.

## Areas

We have the following areas:

a) lateral area (**THE _{L}**): sum of the areas of the congruent isosceles trapezius forming the lateral faces.

b) total area (**THE _{T}**): sum of the lateral area with the sum of the smaller base areas

**(THE**it's bigger

_{B})**(THE**.

_{B})THE_{T} = A_{L}+ A_{B}+ A_{B} |

## Volume

The volume of a regular pyramid trunk is given by:

Since V is the volume of the pyramid and V 'is the volume of the pyramid obtained by the section, the relation is valid: