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The number of points (n), chords (c) and regions (r G) for first 6 terms of Moser's circle problem. In geometry, the problem of dividing a circle into areas by means of an inscribed polygon with n sides in such a way as to maximise the number of areas created by the edges and diagonals, sometimes called Moser's circle problem (named after Leo Moser), has a solution by an inductive method.
The center lens of the 2-circle figure is called a vesica piscis, from Euclid. Two circles are also called Villarceau circles as a plane intersection of a torus. The areas inside one circle and outside the other circle is called a lune. The 3-circle figure resembles a depiction of Borromean rings and is used in 3-set theory Venn diagrams.
A uniform polyhedron has regular polygons as faces, such that for every two vertices there is an isometry mapping one into the other (just as there is for a regular polygon). A quasiregular polyhedron is a uniform polyhedron which has just two kinds of face alternating around each vertex.
If the angle subtended by the chord at the centre is 90°, then ℓ = r √2, where ℓ is the length of the chord, and r is the radius of the circle. If two secants are inscribed in the circle as shown at right, then the measurement of angle A is equal to one half the difference of the measurements of the enclosed arcs (⌢ and ⌢).
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In higher-dimensional geometry, the facets (also called hyperfaces) [8] of a n-polytope are the (n − 1)-faces (faces of dimension one less than the polytope itself). [9] A polytope is bounded by its facets. For example: The facets of a line segment are its 0-faces or vertices. The facets of a polygon are its 1-faces or edges.
A chamfer with a "lark's tongue" finish. A chamfer (/ ˈ ʃ æ m f ər / SHAM-fər or / ˈ tʃ æ m f ər / CHAM-fər) is a transitional edge between two faces of an object.Sometimes defined as a form of bevel, it is often created at a 45° angle between two adjoining right-angled faces.
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