Rhombus

In Euclidean geometry, a rhombus(◊), plural rhombi or rhombuses, is a simple (non-self-intersecting) quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral, since equilateral means that all of its sides are equal in length. The rhombus is often called a diamond, after the diamonds suit in playing cards which resembles the projection of an octahedral diamond, or a lozenge, though the former sometimes refers specifically to a rhombus with a 60° angle (see Polyiamond), and the latter sometimes refers specifically to a rhombus with a 45° angle.

Every rhombus is a parallelogram and a kite. A rhombus with right angles is a square.

Etymology

The word "rhombus" comes from Greek ῥόμβος(rhombos), meaning something that spins, which derives from the verb ρέμβω (rhembō), meaning "to turn round and round". The word was used both by Euclid and Archimedes, who used the term "solid rhombus" for two right circular cones sharing a common base.

Characterizations

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Rhombus (disambiguation)

Rhombus may refer to:

Rhombus, a geometric shape (often colloquially described as a diamond)

Rhombus (band), a roots reggae band from New Zealand

Port Rhombus EP, an electronic music EP by Squarepusher

Rhombus (UK band), a Gothic Rock band from The United Kingdom

Rhombus formation, a troop formation

Reticulum, a southern constellation, once called Rhombus

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Rhombus (band)

Rhombus are a dub/drum n bass/reggae/roots band from Wellington, New Zealand.

They were formed in 2001 by Thomas Voyce and Simon Rycroft, later joined by Ahmen Mahal aka Imon Star (who departed from the group in 2007 to pursue his solo project 'Olmecha Supreme') and Koa Williams (Roots Foundation Sound System founding member). The band has toured extensively in their native New Zealand along with a few international dates, notably in Japan (2002) and in Australia, playing twice at the Sydney Opera House in November 2004. Over the years they have performed with such acts as St Germain (France), Fat Freddy's Drop (NZ), Salmonella Dub (NZ), Michael Franti (USA), Dry & Heavy (Japan), Trinity Roots (NZ), Gomez (UK) Kora (NZ), Shapeshifter (NZ), Katchafire (NZ) and also performed at the Big Day Out (NZ) 2006.

The band have also given their time to a number of causes including Greenpeace, Tsunami Relief, SurfAid International, the Cancer Society, and the Peace Boat. Their travels on the Japanese-based global NGO Peace Boat have taken them through the Caribbean (including Jamaica, home of Studio One, King Tubby and many other influential dub and reggae artists), with the intent of "spreading the values of sustainability, co-operation and peace through music workshops from a chartered ship."

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Piñata

A piñata (/pɪnˈjɑːtə/ pin-YAH-tə, Spanish pronunciation: [piˈɲata]) is a container often made of papier-mâché, pottery, or cloth; it is decorated, and filled with small toys or candy, or both, and then broken as part of a ceremony or celebration. Piñatas are commonly associated with Mexico. The idea of breaking a container filled with treats came to Europe in the 14th century, where the name, from the Italian pignatta, was introduced. The Spanish brought the European tradition to Mexico, although there were similar traditions in Mesoamerica. The Aztecs had a similar tradition to honor the birthday of the god Huitzilopochtli in mid December. According to local records, the Mexican piñata tradition began in the town of Acolman, just north of Mexico City, where piñatas were introduced for catechism purposes as well as to co-opt the Huitzilopochtli ceremony. Today, the piñata is still part of Mexican culture, the cultures of other countries in Latin America, as well as the United States, but it has mostly lost its religious character.