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Types of Polyhedrons

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  • 0:00 Polyhedrons
  • 0:40 Platonic Solids
  • 1:25 Prisms
  • 2:15 Pyramids
  • 2:55 Lesson Summary
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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

After watching this video lesson, you will know how to identify polyhedrons and you will become familiar with the common types of polyhedrons found in the world. You will also see real-world examples of polyhedrons in action.

Polyhedrons

In this lesson, we talk about polyhedrons. Polyhedrons are 3-dimensional solids with flat faces. Each side of the polyhedron is a polygon, which is a flat shape with straight sides. Take the cube, for example. It is a polyhedron because all of its faces are flat. Each face of the cube is a square. If you play board games, then you are probably playing with a cube in the form of dice. Most houses are also polyhedrons because all the faces are flat. Any object that you see whose faces are all flat is a polyhedron.

Now, let's talk about some common types of polyhedrons.

Platonic Solids

The cube that we just talked about is also a platonic solid, a special type of polyhedron. A platonic solid is a polyhedron whose faces are all the same. Look at the cube, and you will see that all its faces are squares, and each face is the same as all the others.

Picture of a cube

In the world, there are only five platonic solids. The first is the tetrahedron made up of four faces that are all triangles. The second is the cube made up of six faces that are all squares. The third is the octahedron made up of eight faces that are all triangles. The fourth is the dodecahedron made up of 12 faces that are all pentagons. And the fifth is the icosahedron made up of 20 faces that are all triangles.

Prisms

The next type of polyhedron is the prism. Prisms are 3-dimensional solids that have flat faces and two identical ends. The cross section along the length of the prism is all the same. The most common prism that you will see is the triangular prism that you use in science experiments where you break up white light into a rainbow of colors. You can see that it has two faces that are both triangles. The other faces are rectangles. If you cut anywhere along the length of this prism, you will get the same triangular cross section.

Prism

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