square root and edge angles

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• Root system — This article discusses root systems in mathematics. For root systems of plants, see root. Lie groups …   Wikipedia

• square — square1 W3S2 [skweə US skwer] adj ▬▬▬▬▬▬▬ 1¦(shape)¦ 2¦(angle)¦ 3 square metre/mile etc 4 5 feet/2 metres etc square 5¦(level)¦ 6 square meal 7¦(body)¦ 8 all square 9 (all) square 10 square deal …   Dictionary of contemporary English

• square — 1 adjective 1 SHAPE having four straight equal sides and 90º angles at the corners: a square flower bed 2 ANGLE forming a 90º angle: a square corner | a square jaw | square shoulders 3 square metre/mile etc an area of measurement equal to a… …   Longman dictionary of contemporary English

• Compass and straightedge constructions — Creating a regular hexagon with a ruler and compass Construction of a regular pentagon Compass and straightedge or ruler and compass construction is the construction of lengths, angl …   Wikipedia

• Greek arithmetic, geometry and harmonics: Thales to Plato — Ian Mueller INTRODUCTION: PROCLUS’ HISTORY OF GEOMETRY In a famous passage in Book VII of the Republic starting at Socrates proposes to inquire about the studies (mathēmata) needed to train the young people who will become leaders of the ideal… …   History of philosophy

• Logic and the philosophy of mathematics in the nineteenth century — John Stillwell INTRODUCTION In its history of over two thousand years, mathematics has seldom been disturbed by philosophical disputes. Ever since Plato, who is said to have put the slogan ‘Let no one who is not a geometer enter here’ over the… …   History of philosophy

• garden and landscape design — Introduction       the development and decorative planting of gardens, yards, grounds, parks, and other types of areas. Gardening and landscape design is used to enhance the settings for buildings and public areas and in recreational areas and… …   Universalium

• Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer.       The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …   Universalium

• 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

• Golden ratio — For the Ace of Base album, see The Golden Ratio (album). Not to be confused with Golden number. The golden section is a line segment divided according to the golden ratio: The total length a + b is to the length of the longer segment a as the… …   Wikipedia

• Pythagorean theorem — See also: Pythagorean trigonometric identity The Pythagorean theorem: The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c) …   Wikipedia