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The commonly-used diagram for the Borromean rings consists of three equal circles centered at the points of an equilateral triangle, close enough together that their interiors have a common intersection (such as in a Venn diagram or the three circles used to define the Reuleaux triangle).
The 31 great circles can be seen as the union of edges in 3 polyhedra. The lower right image shows 15 red circles, 10 green circles, and 6 blue circles. In geometry, the 31 great circles of the spherical icosahedron is an arrangement of 31 great circles in icosahedral symmetry. [1]
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The two orange circles are exactly the same size; however, the one on the right appears larger. Ehrenstein illusion: The Ehrenstein illusion is an optical illusion studied by the German psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. Fata Morgana (mirage)
Diagram of a circle. This is a w:vector graphics version of w:Image:Circle-1.png which was licensed under the GFDL. Date: 3 December 2005: Source: Own work: Author: en:User:Optimager: Other versions: Derivative works of this file: CIRCLE 1 be-tarask.svg; CIRCLE 1 mk.svg; Circle-withsegments-notext.svg (no text, colour-coded)
A circle bounds a region of the plane called a disc. The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern
For more information, see the article about circle. Articles relating to circles , a shape consisting of all points in a plane that are at a given distance from a given point, the centre . Equivalently, it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant .
Clusters of stones circles are often found in favorable camp-sites, near water, fuel and good hunting grounds. In many cases the clusters are organized in patterns, such as rows, circles or v-shapes. The stones were used to hold down the tipis to keep the lodge warm and dry. In some cases elaborate walls or defensive structures were built.
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