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Circle Frame A circle is a simple closed shape. It is the set 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 so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius. This article is about circles in Euclidean geometry, and, in particular, the Euclidean plane, except where otherwise noted. A circle is a simple closed curve which divides the plane into two regions: an interior and an exterior [...More...]  "Circle Frame" on: Wikipedia Yahoo 

Circle (other) In mathematics, a circle generally is the set of all points in a plane at a fixed distance from a fixed point [...More...]  "Circle (other)" on: Wikipedia Yahoo 

Circus A circus is a company of performers who put on diverse entertainment shows that include clowns, acrobats, trained animals, trapeze acts, musicians, dancers, hoopers, tightrope walkers, jugglers, magicians, unicyclists, as well as other object manipulation and stuntoriented artists. The term 'circus' also describes the performance which has followed various formats through its 250year modern history. Philip Astley is credited with being the 'father' of the modern circus when he opened the first circus in 1768 in England. A skilled equestrian, Astley demonstrated trick riding, riding in a circle rather than a straight line as his rivals did, and thus chanced on the format which was later named a 'circus'. In 1770 he hired acrobats, tightrope walkers, jugglers and a clown to fill in the pauses between acts. Performances developed significantly through the next fifty years, with largescale theatrical battle reenactments becoming a significant feature [...More...]  "Circus" on: Wikipedia Yahoo 

Circular Segment In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord. More formally, a circular segment is a region of twodimensional space that is bounded by an arc (of less than 180°) of a circle and by the chord connecting the endpoints of the arc.Contents1 Formula1.1 Area 1.2 Applications2 See also 3 References 4 External linksFormula[edit]A circular segment (in green) is enclosed between a secant/chord (the dashed line) and the arc whose endpoints equal the chord's (the arc shown above the green area).Let R be the radius of the circle, θ the central angle in radians, α is the central angle in degrees, c the chord length, s the arc length, h the sagitta (height) of the segment, and d the height of the triangular portion. The radius is R = h + d = h 2 + [...More...]  "Circular Segment" on: Wikipedia Yahoo 

Secant Line In geometry, a secant of a curve is a line that intersects the curve in at least two (distinct) points.[1] The word secant comes from the Latin Latin word secare, meaning to cut.[2] In the case of a circle, a secant will intersect the circle in exactly two points and a chord is the line segment determined by these two points, that is the interval on a secant whose endpoints are these points.[3]Contents1 Circles 2 Curves2.1 Secants and tangents3 Sets and nsecants 4 See also 5 References 6 External linksCircles[edit] Further information: Circle Circle § ChordsCommon lines and line segments on a circle, including a secantA straight line can intersect a circle in two, one or zero points. A line intersecting in two points is called a secant line, in one point a tangent line and in no points an exterior line. A chord of a circle is the line segment that joins two distinct points of the circle [...More...]  "Secant Line" on: Wikipedia Yahoo 

Semicircle In mathematics (and more specifically geometry), a semicircle is a onedimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180° (equivalently, π radians, or a halfturn). It has only one line of symmetry (reflection symmetry) [...More...]  "Semicircle" on: Wikipedia Yahoo 

Tangent In geometry, the tangent line (or simply tangent) to a plane curve at a given point is the straight line that "just touches" the curve at that point. Leibniz Leibniz defined it as the line through a pair of infinitely close points on the curve.[1] More precisely, a straight line is said to be a tangent of a curve y = f (x) at a point x = c on the curve if the line passes through the point (c, f (c)) on the curve and has slope f '(c) where f ' is the derivative of f. A similar definition applies to space curves and curves in ndimensional Euclidean space. As it passes through the point where the tangent line and the curve meet, called the point of tangency, the tangent line is "going in the same direction" as the curve, and is thus the best straightline approximation to the curve at that point. Similarly, the tangent plane to a surface at a given point is the plane that "just touches" the surface at that point [...More...]  "Tangent" on: Wikipedia Yahoo 

Compass (drafting) A pair of compasses, also known simply as a compass, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, they can also be used as tools to measure distances, in particular on maps. Compasses can be used for mathematics, drafting, navigation and other purposes. Compasses are usually made of metal or plastic, and consist of two parts connected by a hinge which can be adjusted to allow the changing of the radius of the circle drawn. Typically one part has a spike at its end, and the other part a pencil, or sometimes a pen. Prior to computerization, compasses and other tools for manual drafting were often packaged as a "bow set"[1] with interchangeable parts [...More...]  "Compass (drafting)" on: Wikipedia Yahoo 

Creation Myth A creation myth (or cosmogonic myth) is a symbolic narrative of how the world began and how people first came to inhabit it.[2][3][4] While in popular usage the term myth often refers to false or fanciful stories, members of cultures often ascribe varying degrees of truth to their creation myths.[5][6] In the society in which it is told, a creation myth is usually regarded as conveying profound truths, metaphorically, symbolically and sometimes in a historical or literal sense.[7][8] They are commonly, although not always, considered cosmogonical myths – that is, they describe the ordering of the cosmos from a state of chaos or amorphousness.[9] Creation myths often share a number of features [...More...]  "Creation Myth" on: Wikipedia Yahoo 

Halo (religious Iconography) A halo (from Greek ἅλως, halōs;[1] also known as a nimbus, aureole, glory, or gloriole) is a crown of light rays, circle or disk of light[2] that surrounds a person in art. They have been used in the iconography of many religions to indicate holy or sacred figures, and have at various periods also been used in images of rulers or heroes. In the sacred art of Ancient Greece, Ancient Rome, Hinduism, Buddhism, Islam Islam and Christianity, among other religions, sacred persons may be depicted with a halo in the form of a circular glow, or flames in Asian art, around the head or around the whole body—this last one is often called a mandorla [...More...]  "Halo (religious Iconography)" on: Wikipedia Yahoo 

Greek Language Greek (Modern Greek: ελληνικά [eliniˈka], elliniká, "Greek", ελληνική γλώσσα [eliniˈci ˈɣlosa] ( listen), ellinikí glóssa, "Greek language") is an independent branch of the IndoEuropean family of languages, native to Greece Greece and other parts of the Eastern Mediterranean [...More...]  "Greek Language" on: Wikipedia Yahoo 

Metathesis (linguistics) Metathesis (/mɪˈtæθɪsɪs/; from Greek μετάθεσις, from μετατίθημι "I put in a different order"; Latin: trānspositiō) is the transposition of sounds or syllables in a word or of words in a sentence [...More...]  "Metathesis (linguistics)" on: Wikipedia Yahoo 

Homeric Greek Homeric Greek is the form of the Greek language Greek language that was used by Homer in the Iliad Iliad and Odyssey Odyssey and in the Homeric Hymns [...More...]  "Homeric Greek" on: Wikipedia Yahoo 

Arabic Arabic Arabic (Arabic: العَرَبِيَّة) alʻarabiyyah [ʔalʕaraˈbijːah] ( listen) or (Arabic: عَرَبِيّ) ʻarabī [ˈʕarabiː] ( listen) or [ʕaraˈbij]) is a Central Semitic language that first emerged in Iron Age northwestern Arabia and is now the lingua franca of the Arab world.[4] It is named after the Arabs, a term initially used to describe peoples living from Mesopotamia Mesopotamia in the east to the Anti Lebanon Lebanon mountains in the west, in northwestern Arabia, and in the Sinai peninsula. Arabic Arabic is classified as a macrolanguage comprising 30 modern varieties, including its standard form (Modern Standard Arabic) [5]. The modern written language (Modern Standard Arabic) is derived from Classical Arabic [...More...]  "Arabic" on: Wikipedia Yahoo 

Coplanar In geometry, a set of points in space are coplanar if there exists a geometric plane that contains them all. For example, three points are always coplanar, and if the points are distinct and noncollinear, the plane they determine is unique. However, a set of four or more distinct points will, in general, not lie in a single plane. Two lines in threedimensional space are coplanar if there is a plane that includes them both. This occurs if the lines are parallel, or if they intersect each other [...More...]  "Coplanar" on: Wikipedia Yahoo 

Astronomical Astronomy Astronomy (from Greek: ἀστρονομία) is a natural science that studies celestial objects and phenomena. It applies mathematics, physics, and chemistry, in an effort to explain the origin of those objects and phenomena and their evolution. Objects of interest include planets, moons, stars, galaxies, and comets; the phenomena include supernova explosions, gamma ray bursts, and cosmic microwave background radiation. More generally, all phenomena that originate outside Earth's atmosphere Earth's atmosphere are within the purview of astronomy. A related but distinct subject, physical cosmology, is concerned with the study of the Universe Universe as a whole.[1] Astronomy Astronomy is one of the oldest of the natural sciences [...More...]  "Astronomical" on: Wikipedia Yahoo 