making+a+right+angle
51electricity — /i lek tris i tee, ee lek /, n. 1. See electric charge. 2. See electric current. 3. the science dealing with electric charges and currents. 4. a state or feeling of excitement, anticipation, tension, etc. [1640 50; ELECTRIC + ITY] * * *… …
52Commutator (electric) — This article is about the electrical component. For mathematical concept, see Commutator . A tiny 5 segment commutator less than 2 mm in diameter, on a direct current motor in a toy radio control ZipZaps car. A commutator is a rotary electri …
53printmaking — /print may king/, n. the art or technique of making prints, esp. as practiced in engraving, etching, drypoint, woodcut or serigraphy. [1925 30; PRINT + MAKING] * * * Art form consisting of the production of images, usually on paper but… …
54Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
55Mercator projection — of the world between 82°S and 82°N. Mercator world …
56trigonometry — 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… …
57Pinball — covered case called a pinball machine. The primary objective of the game is to score as many points as possible. Secondary objectives are to maximize the time spent playing (by earning extra balls and keeping the ball in play as long as possible) …
58Pickett's Charge — was an infantry assault ordered by Confederate General Robert E. Lee against Maj. Gen. George G. Meade s Union positions on Cemetery Ridge on July 3, 1863, the last day of the Battle of Gettysburg during the American Civil War. Its futility was… …
59Differential geometry of surfaces — Carl Friedrich Gauss in 1828 In mathematics, the differential geometry of surfaces deals with smooth surfaces with various additional structures, most often, a Riemannian metric. Surfaces have been extensively studied from various perspectives:… …
60Muhammad al-Durrah incident — Muhammad al Durrah incident …
