polygonal figures
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Polygonal number — In mathematics, a polygonal number is a number that can be arranged as a regular polygon. Ancient mathematicians discovered that numbers could be arranged in certain ways when they were represented by pebbles or seeds; such numbers, which can be… … Wikipedia
Straight skeleton — In geometry, a straight skeleton is a method of representing a polygon by a topological skeleton. It is similar in some ways to the medial axis but differs in that the skeleton is composed of straight line segments, while the medial axis of a… … Wikipedia
number game — Introduction any of various puzzles and games that involve aspects of mathematics. Mathematical recreations comprise puzzles and games that vary from naive amusements to sophisticated problems, some of which have never been solved.… … Universalium
Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… … Universalium
Islamic arts — Visual, literary, and performing arts of the populations that adopted Islam from the 7th century. Islamic visual arts are decorative, colourful, and, in religious art, nonrepresentational; the characteristic Islamic decoration is the arabesque.… … Universalium
Cathedral of Toledo — The Cathedral of Saint Mary of Toledo, also called Primate Cathedral of Toledo, is a church in Spain. The seat of the Archdiocese of Toledo, it is one of the three 13th century High Gothic cathedrals in Spain and is considered to be the magnum… … Wikipedia
mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… … Universalium
JERUSALEM — The entry is arranged according to the following outline: history name protohistory the bronze age david and first temple period second temple period the roman period byzantine jerusalem arab period crusader period mamluk period … Encyclopedia of Judaism
Cueva de La Pasiega — Cueva de La Pasiega, or Cave of La Pasiega, situated in the Spanish municipality of Puente Viesgo, is one of the most important monuments of Paleolithic art in Cantabria. It is included in the UNESCO schedule of Human Heritage since July 2008,… … Wikipedia
Architecture of the medieval cathedrals of England — The medieval cathedrals of England, dating from between approximately 1040 and 1540, are a group of twenty five buildings which together constitute a major aspect of the country’s artistic heritage and are among the most significant material… … Wikipedia
List of towers in Somerset — The Somerset Towers, built in the 14th to 16th centuries, have been describe as among England s finest contributions to medieval art.cite book |last= Jenkins|first=Simon|title= England s Thousand Best Churches|year= 2000|publisher= Penguin… … Wikipedia
