trigonometrical ratio

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• inverse function — /ɪnvɜs ˈfʌŋkʃən/ (say invers fungkshuhn) noun the mathematical function which replaces another function when the dependent and independent variables of the first function are interchanged. If y is a trigonometrical ratio of the angle x, as y =… …  

• optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

• Logarithm — The graph of the logarithm to base 2 crosses the x axis (horizontal axis) at 1 and passes through the points with coordinates (2, 1), (4, 2), and (8, 3) …   Wikipedia

• Optical aberration — v · d · e Optical aberration …   Wikipedia

• History of geometry — Geometry (Greek γεωμετρία ; geo = earth, metria = measure) arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre modern mathematics, the other being the study of numbers. Classic geometry… …   Wikipedia

• Skew arch — A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and its …   Wikipedia

• History of mathematics — A proof from Euclid s Elements, widely considered the most influential textbook of all time.[1] …   Wikipedia

• trigonometry — trigonometric /trig euh neuh me trik/, trigonometrical, adj. trigonometrically, adv. /trig euh nom i tree/, n. the branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the… …   Universalium

• Sector (instrument) — The sector, also known as a proportional compass or military compass, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. It is an instrument consisting of two rulers of equal length which …   Wikipedia

• Sitakunda Upazila — Infobox of upazilas native name = Sitakunda locator position = right latd = 22.6167 longd = 91.6611 division name = Chittagong Division district = Chittagong District population as of = 1991 population total = 274903 population density = 568 area …   Wikipedia

• Secant — Secant, n. [Cf. F. s[ e]cante. See {Secant}, a.] 1. (Geom.) A line that cuts another; especially, a straight line cutting a curve in two or more points. [1913 Webster] 2. (Trig.) A right line drawn from the center of a circle through one end of a …   The Collaborative International Dictionary of English