of what it calls "integrated fixed towers." In April 2012, CBP issued a request for proposal to build a single tower near Nogales, Arizona, and more than 100 companies, including Boeing, Lockheed Martin, Raytheon, and General Dynamics, expressed interest in pursuing the project. CBP was scheduled to choose a vendor in the fall of 2012.

If the federal government and its various contractors have learned anything during the last 15 years, it's that building a fence, especially a virtual one, over terrain that spans desolate mountains, wind-swept deserts, and meandering rivers, is no easy task. According to Robert Lee Maril, an East Carolina University sociologist who has written two books about the border, much of the equipment that was installed during the ISIS era is now "rotting in thepentadecagon at given side length, calculation of the circumradius  (German)
 Construction of the pentadecagon at given side length, exemplification: circumradius

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Category:Polygons
Category:Constructible polygons