Question: The Golden Triangle where the fortune of an American entrepreneur and engineer who invented what was made?

The Westplex is part of St. Charles County that used to be called “The Golden Triangle” .  The “Triangle” was formed by I-70 across the top, Missouri Route 94 to the east, and I-64 to the west.  With the three legs together, a triangle resting on its tip is formed.  Since almost all of the growth in St. Charles County was within this triangle it was dubbed the “Golden” area of St. Charles county, hence, Golden Triangle.  Today the Westplex is made up of St. Charles, St. Peters, Weldon Spring, Cottleville, Dardenne Prairie, O’Fallon, Lake St. Louis, Wentzville and St. Paul. <SEP>  Based in Pittsburgh, Pennsylvania for much of his career, Westinghouse was one of Thomas Edison's main rivals in the early implementation of the American electricity system.  Westinghouse's electricity distribution system, based on alternating current, ultimately prevailed over Edison's insistence on direct current.  In 1911 Westinghouse received the AIEE's Edison Medal "For meritorious achievement in connection with the development of the alternating current system." George Westinghouse Jr. (October 6, 1846 – March 12, 1914) was an American entrepreneur and engineer who invented the railway air brake and was a pioneer of the electrical industry, gaining his first patent at the age of 19. <SEP>  It is located at the confluence of the Allegheny River and the Monongahela River whose joining forms the Ohio River.  The "triangle" is bounded by the two rivers.  The area features offices for major corporations such as PNC Bank, U.S. Steel, PPG, Bank of New York Mellon, Heinz, Federated Investors and Alcoa. Downtown Pittsburgh, colloquially referred to as the Golden Triangle or Dahntahn in eye dialect, and officially the Central Business District, is the urban downtown center of Pittsburgh.  It is where the fortunes of such industrial barons as Andrew Carnegie, Henry Clay Frick, Henry J. Heinz, Andrew Mellon and George Westinghouse were made.  It contains the site where the French fort, Fort Duquesne, once stood. <SEP> Golden Triangle of Jakarta (Indonesian: "Segitiga Emas Jakarta" ) is roughly a triangular shape area of Jakarta, Indonesia, which extends from Central Jakarta to South Jakarta.  Most of the business, financial, and diplomatic establishments are located in the area, which also forms the center of the city.  The area is the main CBD of Jakarta, where most of the tallest skyscrapers are located.  The area is bordered by main avenues of Jakarta, Jalan M.H. Thamrin-Jalan Jenderal Sudirman (North-Southwest), Jalan H.R. Rasuna Said (North-Southeast), and Jalan Jenderal Gatot Subroto (East-West).  There are many other roads criss-crossing the area.  There are at least 3 main centers of commercial buildings such as SCBD (45 hectares), Mega Kuningan (54 hectares) and Kuningan Persada (17 hectares). Another cluster is "Rasuna Epicentrum", which is an area of 53.6 hectares, consisting of residential, offices, hotels, hospitals, places of worship, sports, shopping and entertainment and education in one area.  Golden triangle is one of the fastest evolving CBD in Asia-Pacific region.