2. Joining two vertices of a polyhedron not in the same face. The opposite sides are parallel. Joining two nonadjacent vertices of a polygon. A diagonal is a line segment that links two vertices of a polygon that are not adjacent. A diagonal in geometry is a diagonal line segment that connects two nonconsecutive vertices of either a polygon (a two-dimensional figure) or a polyhedron (a three-dimensional figure). Illustrated definition of Diagonal: A line segment that goes from one corner to another, but is not an edge. diagonal adj. en.wiktionary.org.

diagonal (adj.) diagonal /daɪˈæɡənəl/ Definitions. The diagonals bisect each other. Math Open Reference. ... geometry - the pure mathematics of points and lines and curves and surfaces. Writing a Good Definition 2 min . Definition Of Diagonal. 1. Postulate, Axiom, Conjecture 2 min . en.wiktionary.org. Diagonal. diagonal has definitions from the fields of mathematics,geometry 1 [ adjective ] (geometry) at an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face . The number of diagonals of a polygon of n sides can be found using the formula . More About Diagonal. diagonal definition: 1. More About Diagonal. 2. connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face "a diagonal line across the page" diagonal (n.) 1. a punctuation mark (/) used to separate related items of information. How to use geometry in a sentence. So a triangle, the simplest polygon, has no diagonals. Definition: The diagonal of a polygon is a line segment linking two non-adjacent vertices.

The word diagonal derives from the ancient Greek διαγώνιος diagonios, "from angle to angle" (from διά- dia-, "through", "across" and γωνία gonia, "angle", related to gony "knee"); it was used by both Strabo and Euclid to refer to a line connecting two vertices of a rhombus or cuboid, and later adopted into Latin as diagonus ("slanting line"). en.wiktionary.org (geometry) Joining two nonadjacent vertices (of a polygon or polyhedron). Try this Adjust the number of sides of the polygon below, or drag a vertex to note the behavior of the diagonals.

A quadrilateral, the next-simplest, has two diagonals. You cannot draw a line from one interior angle to any other interior angle that is not also a side of the triangle. Rhombus. Learn more. The number of diagonals of an n-sided polygon is: n(n − 3) / 2 Having a slanted or oblique direction, lines or markings. Geometry definition is - a branch of mathematics that deals with the measurement, properties, and relationships of points, lines, angles, surfaces, and solids; broadly : the study of properties of given elements that remain invariant under specified transformations.