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The Pentagon is [[List of largest office buildings|the world's second-largest office building]], with about {{convert|6.5|e6ft2|m2}} of floor space, {{convert|3.7|e6ft2|m2}} of which are used as offices.<ref>{{cite web |last=Hancock |first=Michaila |title=Pentagon: the world's largest office building - in infographics |url=http://www.architectsjournal.co.uk/news/pentagon-the-worlds-largest-office-building-in-infographics |website=The Architects' Journal |date=27 August 2015 |access-date=27 February 2021 |archive-date=15 January 2021 |archive-url=https://web.archive.org/web/20210115120127/https://www.architectsjournal.co.uk/news/pentagon-the-worlds-largest-office-building-in-infographics |url-status=live }}</ref><ref name="faf">{{cite web |title=The Pentagon, Facts & Figures |url=https://pentagontours.osd.mil/facts.jsp |url-status=dead |access-date=23 August 2014 |archive-url=https://web.archive.org/web/20140819131241/https://pentagontours.osd.mil/facts.jsp |archive-date=19 August 2014}}</ref> It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of {{cvt|17.5|mi}}<ref name="faf"/> of corridors, with a central {{cvt|5|acre|adj=on|spell=in}}<!--five-acre (20,000 m<sup>2</sup>)--> pentagonal plaza. About 23,000 military and civilian employees work in the Pentagon, as well as about 3,000 non-defense support personnel.<ref name="faf"/>
In 2001, the Pentagon was damaged during the [[September 11 attacks]]. Five [[al-Qaeda]] hijackers flew [[American Airlines Flight 77]] into the western side of the building, killing themselves and 184 other people, including 59 on the airplane and 125 in the Pentagon.<ref>{{Cite news |last=Stone |first=Andrea |date=August 20, 2002 |title=Military's aid and comfort ease 9/11 survivors' burden |work=USA TODAY |url=http://usatoday30.usatoday.com/news/sept11/2002-08-20-pentagon_x.htm |access-date=September 12, 2021 |archive-date=11 March 2015 |archive-url=https://web.archive.org/web/20150311101856/http://usatoday30.usatoday.com/news/sept11/2002-08-20-pentagon_x.htm |url-status=live }}</ref> It was the first significant foreign attack on federal facilities in the capital area since the [[burning of Washington]] during the [[War of 1812]].{{citation needed|date=July 2023}} Following the attacks, the western side of the building was repaired, with a small indoor memorial and chapel added at the point of impact. The coordinated attacks, which killed 2,
In 2009, an [[Pentagon Memorial|outdoor memorial]] dedicated to the Pentagon victims of the September 11 attacks was opened.
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