Características y propiedades del triangulo y del cuadrilátero

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Características y propiedades del triangulo y del cuadrilátero.

Triangulo:
Un triángulo, en geometría, es un polígono de tres lados determinado por tres segmentos de tres rectas que se cortan, denominados lados (Euclides); o tres puntos no alineados llamados vértices. También puede determinarse un triángulo por cualesquiera otros tres elementos relativos a él, como por ejemplo un ángulo y dosmedianas; o un lado, una altura y una mediana.

Los triángulos son polígonos así que tienen tres lados entonces tienen tres ángulos, la suma de lo largo de dos de sus lados siempre es mas grande que la longitud del tercer lado.
Los triángulos son figuras planas que se componen de base, vértice, altura, y lados, tienen área pero no volumen, la suma de los ángulos de cualquier triangulo es de180°

Cuadriláteros:
Un cuadrilátero es un polígono delimitado por cuatro lados y cuatro ángulos y cuatro vértices. Sus lados pueden ser consecutivos u opuestos tienen distinta forma pero todos ellos tienen cuatro vértices y dos diagonales.

La suma de los ángulos de adentro son iguales a cuatro ángulos rectos (90°x4=360°) La suma de los ángulos de afuera es igual es igual a cuatro ángulosrectos (360°).
Los cuadriláteros son los únicos polígonos en los que la suma de los ángulos de afuera es igual a los interiores.

BRUSSELS — European regulators threw up a roadblock Thursday to the proposed takeover of Sun Microsystems by the software company Oracle, indicating that the combination could squelch the growth of a popular, free corporate database software owned by Sun.The decision bythe European Commission to extend its investigation into the deal, worth $7.4 billion, is especially sensitive because the U.S. Department of Justice has already approved the merger. Regulators in the United States questioned Oracle’s market power in some areas of its business but raised fewer concerns than the Europeans about open-source software.In announcing the decision, Neelie Kroes, theEuropean Union’s competition commissioner, appeared to signal a different approach Thursday, warning that the acquisition could hamper development of an important software product owned by Sun, which specializes in computer hardware. The product, MySQL, is the most widely used corporate database software in the world, and it competes with products produced by Oracle.Ms. Kroes said preserving access toopen-source software was vital when much of the world, including Europe, may just be emerging from a deep slump.“In the current economic context, all companies are looking for cost-effective technologies,” Ms. Kroes said, referring to open-source software. “Systems based on open-source software are increasingly emerging as viable alternatives to proprietary solutions.”She said a longerinvestigation was needed “to ensure that such alternatives would continue to be available.”The commission has at least three months, or until Jan. 19, before making a decision to clear the deal or to issue an order blocking it.European and American antitrust authorities have sought to narrow their differences in recent years in a bid to avoid tussles that have marred trans-Atlantic relations this decade.Mario Monti, a former competition commissioner, outraged U.S. officials by blocking General Electric from taking over Honeywell in 2003. Mr. Monti said that G.E. would become too dominant in markets for aircraft engines. In recent years, Mr. Monti and Ms. Kroes also have found themselves at odds with some of their American counterparts on whether to force Microsoft to change its Windows operatingsystem.Antitrust experts said the decision to investigate the effects on open-source software of Oracle’s acquisition of Sun showed that differences persisted between U.S. and European regulators.“Europeans still have a lot more concerns than Americans about companies using strong or dominant positions to create a bottlenecks for competitors in the information and technology sectors,” said Peter...
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