quadrilatéral
81Non-Euclidean geometry — Behavior of lines with a common perpendicular in each of the three types of geometry Non Euclidean geometry is the term used to refer to two specific geometries which are, loosely speaking, obtained by negating the Euclidean parallel postulate,… …
82Omar Khayyám — Khayyam redirects here. For other uses, see Khayyam (disambiguation). Omar Khayyám عمر خیام A depiction of Omar Khayyám, in the works of Edward FitzGerald Full name Omar Khayyám عمر خیام …
83Japanese theorem for concyclic quadrilaterals — The Japanese theorem states that the centers of the incircles of certain triangles inside a concyclic quadrilateral are vertices of a rectangle.Triangulate an arbitrary concyclic quadrilateral by its diagonals, this yields four overlapping… …
84pyroxene — pyroxenic /puy rok sen ik/, adj. /puy rok seen, peuh , puy rok seen /, n. any of a very common group of minerals of many varieties, silicates of magnesium, iron, calcium, and other elements, occurring as important constituents of many kinds of… …
85North–South and East–West Corridor — National highways with the north–south (red) and east–west (green) corridors highlighted Route information Length: 7,300 km (4,500 …
86Nine-point circle — The nine points In geometry, the nine point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant points defined from the triangle. These nine points are: The midpoint of each …
87Concyclic points — In geometry, a set of points is said to be concyclic (or cocyclic) if they lie on a common circle. Concyclic points, showing that the perpendicular bisectors of pairs are concurrent …
88Parts of a sail — In sailing the parts of a sail have common terminology for each corner and edge of the sail. Contents 1 Triangular Sails 1.1 The corners 1.2 The edges 1.3 The roach …
89Indian mathematics — mdash;which here is the mathematics that emerged in South Asia from ancient times until the end of the 18th century mdash;had its beginnings in the Bronze Age Indus Valley civilization (2600 1900 BCE) and the Iron Age Vedic culture (1500 500 BCE) …
90Japanese theorem for concyclic polygons — In geometry, the Japanese theorem states that no matter how we triangulate a concyclic polygon, the sum of inradii of triangles is constant. Conversely, if the sum of inradii independent from the triangulation, then the polygon is cyclic. The… …
