60-529: (Redirected from DART ) [REDACTED] Look up Dart , dart , or DART in Wiktionary, the free dictionary. Dart or DART may refer to: Arts, entertainment and media [ edit ] Dart, the equipment in the game of darts Dart (comics) , an Image Comics superhero Dart, a character from G.I. Joe Dart, a Thomas & Friends railway engine character Dart Feld, protagonist in
120-404: A {\displaystyle a} and b {\displaystyle b} , the radius r {\displaystyle r} of the inscribed circle is r = p q 2 ( a + b ) , {\displaystyle r={\frac {pq}{2(a+b)}},} and the radius ρ {\displaystyle \rho } of the ex-tangential circle
180-522: A character from G.I. Joe Dart, a Thomas & Friends railway engine character Dart Feld, protagonist in the video game The Legend of Dragoon Dart (poetry collection) , a 2002 collection by British poet Alice Oswald Dart (sewing) , a fold sewn into the fabric of a garment Businesses and organizations [ edit ] Dart (commercial vehicle) , a former manufacturer of commercial vehicles in Iowa Dart Container ,
240-478: A deltoid curve , an unrelated geometric object sometimes studied in connection with quadrilaterals. A kite may also be called a dart , particularly if it is not convex. Every kite is an orthodiagonal quadrilateral (its diagonals are at right angles) and, when convex, a tangential quadrilateral (its sides are tangent to an inscribed circle). The convex kites are exactly the quadrilaterals that are both orthodiagonal and tangential. They include as special cases
300-473: A 2007 paper Schwartz solved this problem by finding unbounded billiards paths for the kite with angles 72°, 72°, 72°, 144°, the same as the one used in the Penrose tiling. He later wrote a monograph analyzing outer billiards for kite shapes more generally. For this problem, any affine transformation of a kite preserves the dynamical properties of outer billiards on it, and it is possible to transform any kite into
360-791: A Texas transit agency Dar Rapid Transit Agency , a bus rapid transit system in Dar es Salaam, Tanzania DART First State , a transit system in Delaware, US Des Moines Area Regional Transit , Iowa, US Dial-a-Ride Transit , a form of public transport in the UK Dixie Area Rapid Transit, the former name of SunTran in Utah, US Doncaster Area Rapid Transit, a section of SmartBus routes in Melbourne, Australia Dublin Area Rapid Transit ,
420-464: A Texas transit agency Dar Rapid Transit Agency , a bus rapid transit system in Dar es Salaam, Tanzania DART First State , a transit system in Delaware, US Des Moines Area Regional Transit , Iowa, US Dial-a-Ride Transit , a form of public transport in the UK Dixie Area Rapid Transit, the former name of SunTran in Utah, US Doncaster Area Rapid Transit, a section of SmartBus routes in Melbourne, Australia Dublin Area Rapid Transit ,
480-718: A US cup and container manufacturer Dart Container Line , a shipping consortium that operated from 1969 to 1981 Dart Drug , a former US drug-store chain Dart Group , a British airline and industrial holding company Dart Industries , a US drug-store group founded by Justin Whitlock Dart Dart Music , a digital music aggregator based in Tennessee Dart National Bank , a private bank in Michigan Direct Action and Research Training Center ,
540-676: A community organizing network in several states of the US Disaster Assistance and Rescue Team , a Singapore Civil Defence Force team Disaster Assistance Response Team , a Canadian Forces team Places [ edit ] Cape Dart , a cape on Siple Island, Marie Byrd Land Dart Island , an island off the coast of Tasmania Dart River (disambiguation) Dart, Ohio , an unincorporated community Science and technology [ edit ] Biology [ edit ] Love dart , an object created by hermaphroditic snails and slugs during courtship Dart, some moth species in
600-611: A community organizing network in several states of the US Disaster Assistance and Rescue Team , a Singapore Civil Defence Force team Disaster Assistance Response Team , a Canadian Forces team Places [ edit ] Cape Dart , a cape on Siple Island, Marie Byrd Land Dart Island , an island off the coast of Tasmania Dart River (disambiguation) Dart, Ohio , an unincorporated community Science and technology [ edit ] Biology [ edit ] Love dart , an object created by hermaphroditic snails and slugs during courtship Dart, some moth species in
660-409: A component of an enhanced tsunami warning system Direct analysis in real time (DART), an ion source used in mass spectrometry Diversity arrays technology (DArT), a technology used in molecular genetics Transport [ edit ] Dart (ship) , a list of ships with the name Dart Dart , an 1863 South Devon Railway Eagle class locomotive Dart charge, the charging system for
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#1732848881440720-409: A component of an enhanced tsunami warning system Direct analysis in real time (DART), an ion source used in mass spectrometry Diversity arrays technology (DArT), a technology used in molecular genetics Transport [ edit ] Dart (ship) , a list of ships with the name Dart Dart , an 1863 South Devon Railway Eagle class locomotive Dart charge, the charging system for
780-437: A concave kite in geometry Space [ edit ] DART (satellite) , a former NASA spacecraft launched 2005 Double Asteroid Redirection Test , a NASA planetary defense mission that intentionally impacted a space probe onto an asteroid in 2022 Technology [ edit ] DART radiative transfer model , a 3D radiative transfer model used in remote sensing Deep-ocean Assessment and Reporting of Tsunamis ,
840-437: A concave kite in geometry Space [ edit ] DART (satellite) , a former NASA spacecraft launched 2005 Double Asteroid Redirection Test , a NASA planetary defense mission that intentionally impacted a space probe onto an asteroid in 2022 Technology [ edit ] DART radiative transfer model , a 3D radiative transfer model used in remote sensing Deep-ocean Assessment and Reporting of Tsunamis ,
900-549: A different class of quadrilaterals; similarly, the right kites discussed below would not be kites. The remainder of this article follows a hierarchical classification; rhombi, squares, and right kites are all considered kites. By avoiding the need to consider special cases, this classification can simplify some facts about kites. Like kites, a parallelogram also has two pairs of equal-length sides, but they are opposite to each other rather than adjacent. Any non-self-crossing quadrilateral that has an axis of symmetry must be either
960-616: A hovering bird and the sound it makes. According to Olaus Henrici , the name "kite" was given to these shapes by James Joseph Sylvester . Quadrilaterals can be classified hierarchically , meaning that some classes of quadrilaterals include other classes, or partitionally , meaning that each quadrilateral is in only one class. Classified hierarchically, kites include the rhombi (quadrilaterals with four equal sides) and squares . All equilateral kites are rhombi, and all equiangular kites are squares. When classified partitionally, rhombi and squares would not be kites, because they belong to
1020-455: A kite, with a diagonal axis of symmetry; or an isosceles trapezoid , with an axis of symmetry through the midpoints of two sides. These include as special cases the rhombus and the rectangle respectively, and the square, which is a special case of both. The self-crossing quadrilaterals include another class of symmetric quadrilaterals, the antiparallelograms . The right kites have two opposite right angles . The right kites are exactly
1080-718: A railway network in Ireland Luton DART , a rail shuttle serving Luton Airport, United Kingdom Road vehicles [ edit ] Daimler Dart , a British sports car produced 1959–1964 Dennis Dart , a bus chassis model Dodge Dart , an American car produced 1960–1976 Dodge Dart (PF) , an American car produced 2013–2016 Goggomobil Dart , an Australian microcar produced 1959–1961 Other [ edit ] Dart (surname) (people named Dart) See also [ edit ] Darts (disambiguation) All pages with titles beginning with Dart All pages with titles containing Dart Topics referred to by
1140-657: A railway network in Ireland Luton DART , a rail shuttle serving Luton Airport, United Kingdom Road vehicles [ edit ] Daimler Dart , a British sports car produced 1959–1964 Dennis Dart , a bus chassis model Dodge Dart , an American car produced 1960–1976 Dodge Dart (PF) , an American car produced 2013–2016 Goggomobil Dart , an Australian microcar produced 1959–1961 Other [ edit ] Dart (surname) (people named Dart) See also [ edit ] Darts (disambiguation) All pages with titles beginning with Dart All pages with titles containing Dart Topics referred to by
1200-551: A shape where three vertices are at the points ( − 1 , 0 ) {\displaystyle (-1,0)} and ( 0 , ± 1 ) {\displaystyle (0,\pm 1)} , with the fourth at ( α , 0 ) {\displaystyle (\alpha ,0)} with α {\displaystyle \alpha } in the open unit interval ( 0 , 1 ) {\displaystyle (0,1)} . The behavior of outer billiards on any kite depends strongly on
1260-404: A shipping consortium that operated from 1969 to 1981 Dart Drug , a former US drug-store chain Dart Group , a British airline and industrial holding company Dart Industries , a US drug-store group founded by Justin Whitlock Dart Dart Music , a digital music aggregator based in Tennessee Dart National Bank , a private bank in Michigan Direct Action and Research Training Center ,
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#17328488814401320-438: A special case of a Lambert quadrilateral . The fourth angle is acute in hyperbolic geometry and obtuse in spherical geometry . Every kite is an orthodiagonal quadrilateral , meaning that its two diagonals are at right angles to each other. Moreover, one of the two diagonals (the symmetry axis) is the perpendicular bisector of the other, and is also the angle bisector of the two angles it meets. Because of its symmetry,
1380-528: A turboprop engine Missiles and weapons [ edit ] Dart (missile) , a projectile weapon with pointed tip SSM-A-23 Dart , a 1950s American anti-tank missile Sea Dart , a modern British surface-to-air missile Paper dart, another name for a paper plane Dart gun (disambiguation) Public transport [ edit ] Bucks County Transport DART, a bus transit system in Bucks County, Pennsylvania , US Dallas Area Rapid Transit ,
1440-473: A turboprop engine Missiles and weapons [ edit ] Dart (missile) , a projectile weapon with pointed tip SSM-A-23 Dart , a 1950s American anti-tank missile Sea Dart , a modern British surface-to-air missile Paper dart, another name for a paper plane Dart gun (disambiguation) Public transport [ edit ] Bucks County Transport DART, a bus transit system in Bucks County, Pennsylvania , US Dallas Area Rapid Transit ,
1500-448: Is ρ = p q 2 | a − b | . {\displaystyle \rho ={\frac {pq}{2|a-b|}}.} A tangential quadrilateral is also a kite if and only if any one of the following conditions is true: If the diagonals in a tangential quadrilateral A B C D {\displaystyle ABCD} intersect at P {\displaystyle P} , and
1560-434: Is a dynamical system in which, from a point outside a given compact convex set in the plane, one draws a tangent line to the convex set, travels from the starting point along this line to another point equally far from the point of tangency, and then repeats the same process. It had been open since the 1950s whether any system defined in this way could produce paths that get arbitrarily far from their starting point, and in
1620-427: Is also a tangential quadrilateral , a quadrilateral that has an inscribed circle . That is, there exists a circle that is tangent to all four sides. Additionally, if a convex kite is not a rhombus, there is a circle outside the kite that is tangent to the extensions of the four sides; therefore, every convex kite that is not a rhombus is an ex-tangential quadrilateral . The convex kites that are not rhombi are exactly
1680-427: Is called an edge tessellation . One of them is a tiling by a right kite, with 60°, 90°, and 120° angles. It produces the deltoidal trihexagonal tiling (see § Tilings and polyhedra ). A prototile made by eight of these kites tiles the plane only aperiodically , key to a claimed solution of the einstein problem . In non-Euclidean geometry , a kite can have three right angles and one non-right angle, forming
1740-443: Is different from Wikidata All article disambiguation pages All disambiguation pages Dart [REDACTED] Look up Dart , dart , or DART in Wiktionary, the free dictionary. Dart or DART may refer to: Arts, entertainment and media [ edit ] Dart, the equipment in the game of darts Dart (comics) , an Image Comics superhero Dart,
1800-405: Is different from Wikidata All article disambiguation pages All disambiguation pages Kite (geometry) In Euclidean geometry , a kite is a quadrilateral with reflection symmetry across a diagonal . Because of this symmetry, a kite has two equal angles and two pairs of adjacent equal-length sides. Kites are also known as deltoids , but the word deltoid may also refer to
1860-401: Is the set of numbers n {\displaystyle n} such that the polygon has an equidissection into n {\displaystyle n} equal-area triangles. Because of its symmetry, the spectrum of a kite contains all even integers. Certain special kites also contain some odd numbers in their spectra. Every triangle can be subdivided into three right kites meeting at
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1920-544: The Dartford Crossing of the River Thames near London Aircraft [ edit ] Convair F-106 Delta Dart , American interceptor fighter jet Dart (rocketry) , a free-flying top of a sounding rocket Dart Aircraft , a 1930s British aircraft manufacturer Culver Dart , a 1930s American light aircraft Blackburn Dart , a 1920s British biplane Paraavis Dart , a Russian paraglider Rolls-Royce Dart ,
1980-430: The Dartford Crossing of the River Thames near London Aircraft [ edit ] Convair F-106 Delta Dart , American interceptor fighter jet Dart (rocketry) , a free-flying top of a sounding rocket Dart Aircraft , a 1930s British aircraft manufacturer Culver Dart , a 1930s American light aircraft Blackburn Dart , a 1920s British biplane Paraavis Dart , a Russian paraglider Rolls-Royce Dart ,
2040-573: The hyperbolic plane by kites. These polyhedra (equivalently, spherical tilings), the square and deltoidal trihexagonal tilings of the Euclidean plane, and some tilings of the hyperbolic plane are shown in the table below, labeled by face configuration (the numbers of neighbors of each of the four vertices of each tile). Some polyhedra and tilings appear twice, under two different face configurations. The trapezohedra are another family of polyhedra that have congruent kite-shaped faces. In these polyhedra,
2100-552: The incircles of triangles A B P {\displaystyle ABP} , B C P {\displaystyle BCP} , C D P {\displaystyle CDP} , D A P {\displaystyle DAP} have radii r 1 {\displaystyle r_{1}} , r 2 {\displaystyle r_{2}} , r 3 {\displaystyle r_{3}} , and r 4 {\displaystyle r_{4}} respectively, then
2160-508: The prototiles of one version of the Penrose tiling , an aperiodic tiling of the plane discovered by mathematical physicist Roger Penrose . When a kite has angles that, at its apex and one side, sum to π ( 1 − 1 n ) {\displaystyle \pi (1-{\tfrac {1}{n}})} for some positive integer n {\displaystyle n} , then scaled copies of that kite can be used to tile
2220-431: The right kites , with two opposite right angles; the rhombi , with two diagonal axes of symmetry; and the squares , which are also special cases of both right kites and rhombi. The quadrilateral with the greatest ratio of perimeter to diameter is a kite, with 60°, 75°, and 150° angles. Kites of two shapes (one convex and one non-convex) form the prototiles of one of the forms of the Penrose tiling . Kites also form
2280-588: The area can be calculated by dividing the kite into two congruent triangles and applying the SAS formula for their area. If a {\displaystyle a} and b {\displaystyle b} are the lengths of two sides of the kite, and θ {\displaystyle \theta } is the angle between, then the area is A = a b ⋅ sin θ . {\displaystyle \displaystyle A=ab\cdot \sin \theta .} Every convex kite
2340-510: The center of its inscribed circle. More generally, a method based on circle packing can be used to subdivide any polygon with n {\displaystyle n} sides into O ( n ) {\displaystyle O(n)} kites, meeting edge-to-edge. All kites tile the plane by repeated point reflection around the midpoints of their edges, as do more generally all quadrilaterals. Kites and darts with angles 72°, 72°, 72°, 144° and 36°, 72°, 36°, 216°, respectively, form
2400-411: The centers and crossing points of any two intersecting circles . Kites as described here may be either convex or concave , although some sources restrict kite to mean only convex kites. A quadrilateral is a kite if and only if any one of the following conditions is true: Kite quadrilaterals are named for the wind-blown, flying kites , which often have this shape and which are in turn named for
2460-402: The circle, the four vertices of the kite are reciprocal in this sense to the four sides of the isosceles trapezoid. The features of kites and isosceles trapezoids that correspond to each other under this duality are compared in the table below. The equidissection problem concerns the subdivision of polygons into triangles that all have equal areas. In this context, the spectrum of a polygon
Dart - Misplaced Pages Continue
2520-409: The edges of one of the two side lengths of the kite meet at two "pole" vertices, while the edges of the other length form an equatorial zigzag path around the polyhedron. They are the dual polyhedra of the uniform antiprisms . A commonly seen example is the pentagonal trapezohedron , used for ten-sided dice . Mathematician Richard Schwartz has studied outer billiards on kites. Outer billiards
2580-424: The faces of several face-symmetric polyhedra and tessellations , and have been studied in connection with outer billiards , a problem in the advanced mathematics of dynamical systems . A kite is a quadrilateral with reflection symmetry across one of its diagonals. Equivalently, it is a quadrilateral whose four sides can be grouped into two pairs of adjacent equal-length sides. A kite can be constructed from
2640-532: The family Noctuidae Potanthus , a genus of skipper butterflies commonly known as darts Computing [ edit ] Dart (programming language) , a client-focused programming language from Google targeting multiple platforms Microsoft Diagnostics and Recovery Toolset (DaRT), a suite of diagnosis and recovery software Dynamic Analysis and Replanning Tool (DART), a U.S. military artificial intelligence program DART for Publishers, now Google Ad Manager Mathematics [ edit ] Dart,
2700-532: The family Noctuidae Potanthus , a genus of skipper butterflies commonly known as darts Computing [ edit ] Dart (programming language) , a client-focused programming language from Google targeting multiple platforms Microsoft Diagnostics and Recovery Toolset (DaRT), a suite of diagnosis and recovery software Dynamic Analysis and Replanning Tool (DART), a U.S. military artificial intelligence program DART for Publishers, now Google Ad Manager Mathematics [ edit ] Dart,
2760-415: The inscribed circle is tangent to its four sides at the four vertices of an isosceles trapezoid. For any isosceles trapezoid, tangent lines to the circumscribing circle at its four vertices form the four sides of a kite. This correspondence can also be seen as an example of polar reciprocation , a general method for corresponding points with lines and vice versa given a fixed circle. Although they do not touch
2820-404: The kites that are cyclic quadrilaterals , meaning that there is a circle that passes through all their vertices. The cyclic quadrilaterals may equivalently defined as the quadrilaterals in which two opposite angles are supplementary (they add to 180°); if one pair is supplementary the other is as well. Therefore, the right kites are the kites with two opposite supplementary angles, for either of
2880-630: The other two angles of the kite must be equal. The diagonal symmetry axis of a convex kite divides it into two congruent triangles ; the other diagonal divides it into two isosceles triangles . As is true more generally for any orthodiagonal quadrilateral, the area A {\displaystyle A} of a kite may be calculated as half the product of the lengths of the diagonals p {\displaystyle p} and q {\displaystyle q} : A = p ⋅ q 2 . {\displaystyle A={\frac {p\cdot q}{2}}.} Alternatively,
2940-423: The parameter α {\displaystyle \alpha } and in particular whether it is rational . For the case of the Penrose kite, α = 1 / φ 3 {\displaystyle \alpha =1/\varphi ^{3}} , an irrational number, where φ = ( 1 + 5 ) / 2 {\displaystyle \varphi =(1+{\sqrt {5}})/2}
3000-434: The plane in a fractal rosette in which successively larger rings of n {\displaystyle n} kites surround a central point. These rosettes can be used to study the phenomenon of inelastic collapse, in which a system of moving particles meeting in inelastic collisions all coalesce at a common point. A kite with angles 60°, 90°, 120°, 90° can also tile the plane by repeated reflection across its edges;
3060-416: The quadrilateral is a kite if and only if R 1 + R 3 = R 2 + R 4 . {\displaystyle R_{1}+R_{3}=R_{2}+R_{4}.} Kites and isosceles trapezoids are dual to each other, meaning that there is a correspondence between them that reverses the dimension of their parts, taking vertices to sides and sides to vertices. From any kite,
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#17328488814403120-599: The quadrilateral is a kite if and only if r 1 + r 3 = r 2 + r 4 . {\displaystyle r_{1}+r_{3}=r_{2}+r_{4}.} If the excircles to the same four triangles opposite the vertex P {\displaystyle P} have radii R 1 {\displaystyle R_{1}} , R 2 {\displaystyle R_{2}} , R 3 {\displaystyle R_{3}} , and R 4 {\displaystyle R_{4}} respectively, then
3180-536: The quadrilaterals that are both tangential and ex-tangential. For every concave kite there exist two circles tangent to two of the sides and the extensions of the other two: one is interior to the kite and touches the two sides opposite from the concave angle, while the other circle is exterior to the kite and touches the kite on the two edges incident to the concave angle. For a convex kite with diagonal lengths p {\displaystyle p} and q {\displaystyle q} and side lengths
3240-496: The quadrilaterals with the greatest ratio of area to diameter . A kite with three 108° angles and one 36° angle forms the convex hull of the lute of Pythagoras , a fractal made of nested pentagrams . The four sides of this kite lie on four of the sides of a regular pentagon , with a golden triangle glued onto the fifth side. There are only eight polygons that can tile the plane such that reflecting any tile across any one of its edges produces another tile; this arrangement
3300-433: The resulting tessellation, the deltoidal trihexagonal tiling , superposes a tessellation of the plane by regular hexagons and isosceles triangles. The deltoidal icositetrahedron , deltoidal hexecontahedron , and trapezohedron are polyhedra with congruent kite-shaped faces , which can alternatively be thought of as tilings of the sphere by congruent spherical kites. There are infinitely many face-symmetric tilings of
3360-405: The same term [REDACTED] This disambiguation page lists articles associated with the title Dart . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Dart&oldid=1253193103 " Category : Disambiguation pages Hidden categories: Short description
3420-405: The same term [REDACTED] This disambiguation page lists articles associated with the title Dart . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Dart&oldid=1253193103 " Category : Disambiguation pages Hidden categories: Short description
3480-450: The shape that has the greatest ratio of its perimeter to its diameter (maximum distance between any two points) is an equidiagonal kite with angles 60°, 75°, 150°, 75°. Its four vertices lie at the three corners and one of the side midpoints of the Reuleaux triangle . When an equidiagonal kite has side lengths less than or equal to its diagonals, like this one or the square, it is one of
3540-437: The two opposite pairs of angles. Because right kites circumscribe one circle and are inscribed in another circle, they are bicentric quadrilaterals (actually tricentric, as they also have a third circle externally tangent to the extensions of their sides ). If the sizes of an inscribed and a circumscribed circle are fixed, the right kite has the largest area of any quadrilateral trapped between them. Among all quadrilaterals,
3600-402: The video game The Legend of Dragoon Dart (poetry collection) , a 2002 collection by British poet Alice Oswald Dart (sewing) , a fold sewn into the fabric of a garment Businesses and organizations [ edit ] Dart (commercial vehicle) , a former manufacturer of commercial vehicles in Iowa Dart Container , a US cup and container manufacturer Dart Container Line ,
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