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**A quadrangular prism** is a polyhedron, the two faces of which are equal squares lying in parallel planes, and the remaining faces (side faces) are parallelograms that have common sides with these squares.

**A regular quadrangular prism** is a quadrangular prism whose bases have squares and the side faces are rectangles.

**Prism bases** are equal regular squares.

**The side faces** of the prism are rectangles.

**The side edges** of the prism are parallel and equal.

The dimensions of the prism can be expressed in terms of side length **a** and height** h**.

**The total surface area of the prism** is equal to the sum of the area of its lateral surface and the doubled area of base.

Formula of the surface area of a quadrangular prism:

**The volume of a prism** is equal to the product of its height and the area of the base.

Formula of volume of a regular quadrangular prism:

The regular quadrangular prism can be** inscribed into the cylinder**.

The formula for the radius of the cylinder:

The **dual polyhedron** of a direct prism is a bipyramid.

Geometric dimensions of finished prism (mm):

Length = 68

Width = 68

Height = 52

Geometric dimensions of finished prism (mm):

Length = 59

Width = 59

Height = 83

Geometric dimensions of finished prism (mm):

Length = 43

Width = 43

Height = 110

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