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185 (one hundred ndeighty-five) is the
The
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called ''cardinal ...
following 184 and preceding 186.
In mathematics
There are 185 differentdirected graph
In mathematics, and more specifically in graph theory, a directed graph (or digraph) is a graph that is made up of a set of vertices connected by directed edges, often called arcs.
Definition
In formal terms, a directed graph is an ordered pa ...
s on four unlabeled vertices that have at least one sink vertex, with no outgoing edges, 185 ways of permuting the squares of a grid of squares in such a way that each square is one unit away from its original position horizontally, vertically, or diagonally, and 185 matroid
In combinatorics, a branch of mathematics, a matroid is a structure that abstracts and generalizes the notion of linear independence in vector spaces. There are many equivalent ways to define a matroid axiomatically, the most significant being ...
s on five labeled elements in which each element participates in at least one basis.
The Spiral of Theodorus
In geometry, the spiral of Theodorus (also called ''square root spiral'', ''Einstein spiral'', ''Pythagorean spiral'', or ''Pythagoras's snail'') is a spiral composed of right triangles, placed edge-to-edge. It was named after Theodorus of Cyre ...
is formed by unit-length line segments that, together with the center point of the spiral, form right triangle
A right triangle (American English) or right-angled triangle ( British), or more formally an orthogonal triangle, formerly called a rectangled triangle ( grc, ὀρθόσγωνία, lit=upright angle), is a triangle in which one angle is a right a ...
s. 185 of these right triangles fit within the first four turns of this spiral.
See also
* The yearAD 185
Year 185 ( CLXXXV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Lascivius and Atilius (or, less frequently, year 938 ''Ab urbe cond ...
or 185 BC
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Year 185 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Pulcher and Puditanus (or, less frequently, year 569 '' Ab urbe condita''). The denomination 185 BC for this year has be ...
* List of highways numbered 185
*
References
{{DEFAULTSORT:185 (Number) Integers