Pentagon Pentagon In geometry, a pentagon (from the Greek πέντε "pente" and γωνία "gonia", meaning "five" and "angle") is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°. A pentagon may be simple or self-intersecting. A self-intersecting "regular pentagon" (or "star pentagon") is called a pentagram. A "regular pentagon" has Schläfli symbol {5} and interior angles are 108°. A "regular pentagon" has five lines of reflectional symmetry, and rotational symmetry of order 5 (through 72°, 144°, 216° and 288°). The diagonals of a convex regular pentagon are in the golden ratio to its
Victims of Terrorist Attack on the Pentagon Memorial Victims of Terrorist Attack on the Pentagon Memorial The Victims of Terrorist Attack on the Pentagon Memorial is a memorial over a group burial site at Arlington National Cemetery in the United States. It commemorates the victims of the Pentagon, which was struck by al-Qaeda terrorists as part of the September 11 attacks. The memorial specifically honors the five individuals for whom no identifiable remains were found. However, a portion of the remains of 25 other victims are buried at the site. The names of the 115 Pentagon employees and 10 contractors in the building, as well as the 53