In geometry, a polyhedron is a three-dimensional object with flat polygonal faces, sharp corners, and straight edges. Each side is a flat surface and is without any curved surfaces. The word comes from the Greek ‘poly’ (stem of many)  + ‘hedron’ (face). So, a polyhedron  means ‘many-faced geometric shape.’

Examples Of A Polyhedron

A polyhedron features identical faces. Here are some examples of a polyhedron noticeable in everyday life.

  • Pyramid
  • Football
  • Prism
  • House
  • Brick

What Is Not A Polyhedron?

A polyhedron does not feature contain gaps between the edges or vertices. Here are some examples of shapes that aren’t polyhedrons.

  • Cone
  • Sphere
  • Cylinders
  • Coffee Mug

What Is A Regular Polyhedron?

A regular polyhedron is where all faces of an object or shape are a regular polygon. Here are some examples of common polyhedron shapes.

  • Regular tetrahedron
  • Cube
  • Regular octahedron
  • Regular dodecagon
  • Regular icosahedron
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