Diagonal
From Encyclopedia of Mathematics
The segment of the straight line connecting two vertices of a polygon (polyhedron) which do not lie on the same side (face). If the number of vertices of a polygon is $n$, the number of its diagonals is $n(n-3)/2$.
How to Cite This Entry:
Diagonal. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Diagonal&oldid=31591
Diagonal. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Diagonal&oldid=31591
This article was adapted from an original article by E.V. Shikin (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article