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

**A regular triangular prism** is a triangular prism whose bases have regular triangles (all sides of which are equal, the angles between the sides of the base are 60 degrees), and the side faces are rectangles.

**Prism bases** are equal regular triangles.

**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 triangular 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 triangular prism:

The regular triangular 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.

Historically, the concept of "prism" arose from Latin and meant - something sawed.

The animation demonstrates how two parallel planes cutting off the excess form the two bases of the prism. From a single workpiece, you can get both the regular prism and an oblique prism.

Geometric dimensions of finished prism (mm):

Length = 85

Width = 74

Height = 55

Geometric dimensions of finished prism (mm):

Length = 70

Width = 60

Height = 80

Geometric dimensions of finished prism (mm):

Length = 31

Width = 27

Height = 94

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