Difference between revisions of "Octahedron"
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+ | An '''octahedron''' is a type of [[polyhedron]]. | ||
− | + | ==Definition== | |
+ | In Euclidean [[geometry]], an octahedron is any polyhedron with eight [[face]]s. The term is most frequently to refer to a polyhedron with eight [[triangular]] faces, with four meeting at each [[vertex]]. | ||
+ | The [[regular]] [[octahedron]] has eight [[equilateral triangle]] faces and is one of the five [[Platonic solid]]s. It has six vertices, twelve edges, and is [[Platonic solid #Duality | dual]] to the [[cube (geometry)|cube]]. | ||
− | The regular octahedron can be decomposed into two [[square (geometry) | square]] [[pyramid]]s by a plane | + | |
+ | The regular octahedron can be decomposed into two [[square (geometry)|square]] [[pyramid]]s by a plane constructed [[perpendicular]] to the space [[diagonal]] joining two opposite vertices. | ||
+ | |||
+ | ==Related Formulae== | ||
+ | * The surface area <math>A</math> of a regular octahedron with side length <math>a</math> is <math>2\sqrt{3}a^2</math> | ||
+ | * The volume <math>V</math> of a regular octahedron with side length <math>a</math> is <math>\frac{1}{3} \sqrt{2}a^3</math> | ||
==See also== | ==See also== | ||
* [[Polyhedron]] | * [[Polyhedron]] | ||
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+ | [[Category:Definition]] | ||
+ | [[Category:Geometry]] | ||
+ | [[Category:Platonic solids]] |
Latest revision as of 12:19, 21 July 2023
This article is a stub. Help us out by expanding it. An octahedron is a type of polyhedron.
Definition
In Euclidean geometry, an octahedron is any polyhedron with eight faces. The term is most frequently to refer to a polyhedron with eight triangular faces, with four meeting at each vertex. The regular octahedron has eight equilateral triangle faces and is one of the five Platonic solids. It has six vertices, twelve edges, and is dual to the cube.
The regular octahedron can be decomposed into two square pyramids by a plane constructed perpendicular to the space diagonal joining two opposite vertices.
Related Formulae
- The surface area
of a regular octahedron with side length
is
- The volume
of a regular octahedron with side length
is