What is Vertex?
[[File:Polygon_mouths_and_ears.svg|thumb|B is an ear because the line between C and D is completely inside the [[Polygon|shape]]. C is a mouth because the line between A and B is completely outside the shape.]] A '''vertex''' is a corner. More than one vertex are called '''vertices'''. A vertex is a [[Point (geometry)|point]] where two or more [[line]]s, [[curve]]s, [[ray]]s, or [[side]]s meet, and is often represented by letters such as <math>P</math>, <math>Q</math>, <math>R</math> and <math>S</math>.<ref>{{Cite web|date=2020-03-01|title=Compendium of Mathematical Symbols|url=https://mathvault.ca/hub/higher-math/math-symbols/|access-date=2020-08-16|website=Math Vault|language=en-US}}</ref> For example, the vertex of an [[angle]] is the point where the two edges of the angle intersect, and a vertex of a [[cube]] is simply one of its corners—of which there are eight.<ref>{{Cite web|title=What Are Vertices in Math?|url=https://sciencing.com/vertices-math-5066316.html|access-date=2020-08-16|website=Sciencing|language=en}}</ref> The concept of vertex applies to both [[two-dimensional]] and [[three-dimensional]] geometrical objects. For example, a [[tetrahedron]] has four vertices, and a [[pentagon]] has five vertices.<ref>{{Cite web|title=Vertices, Edges and Faces|url=https://www.mathsisfun.com/geometry/vertices-faces-edges.html|access-date=2020-08-16|website=www.mathsisfun.com}}</ref> == Related pages == * [[Graph (mathematics)]] * [[Vertex figure]] == References == <references /> [[Category:Geometry]] {{math-stub}}