angular defect
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Defect (geometry) — For other uses, see Defect. In geometry, the (angular) defect (or deficit or deficiency) means the failure of some angles to add up to the expected amount of 360° or 180°, when such angles in the plane would. The opposite notion is the excess.… … Wikipedia
Defect of illumination — Defect of illumination, is the maximum angular width of the unilluminated part of a celestial body, seen by a given observer. For example, if an object is 40 seconds of arc across and is 75% illuminated, the defect of illumination is 10 seconds… … Wikipedia
Angular diameter — The angular diameter or apparent size of an object as seen from a given position is the “visual diameter” of the object measured as an angle. In the vision sciences it is called the visual angle. The visual diameter is the diameter of the… … Wikipedia
Welding defect — A welding defect is any flaw that compromises the usefulness of the finished weldment. According to the American Society of Mechanical Engineers (ASME) welding defect causes are broken down into the following percentages: 41% poor process… … Wikipedia
Platonic solid — In geometry, a Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex; thus, all… … Wikipedia
Curvature — In mathematics, curvature refers to any of a number of loosely related concepts in different areas of geometry. Intuitively, curvature is the amount by which a geometric object deviates from being flat, or straight in the case of a line, but this … Wikipedia
Gauss–Bonnet theorem — The Gauss–Bonnet theorem or Gauss–Bonnet formula in differential geometry is an important statement about surfaces which connects their geometry (in the sense of curvature) to their topology (in the sense of the Euler characteristic). It is named … Wikipedia
Solide d'Archimède — En géométrie, un solide d Archimède est un polyèdre convexe semi régulier, fortement symétrique composé de deux sortes (ou davantage) de polygones réguliers se rencontrant à des sommets identiques. Ils sont distincts des solides de Platon, qui… … Wikipédia en Français
Modular curve — In number theory and algebraic geometry, a modular curve Y(Γ) is a Riemann surface, or the corresponding algebraic curve, constructed as a quotient of the complex upper half plane H by the action of a congruence subgroup Γ of the modular group of … Wikipedia
Descartes' theorem (disambiguation) — Descartes theorem may refer to: Descartes theorem concerning four mutually tangent circles Descartes theorem on total angular defect Descartes rule of signs This disambiguation page lists articles associated with the same title. If an … Wikipedia
Minor triangle — an angular defect posterior to the anus, produced by attachment of the superficial portion of the external sphincter to the coccyx … Medical dictionary
