
1) Shape
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https://www.crosswordclues.com/clue/pentagon

1) US military nerve center 2) American political novel 3) Arlington building 4) Arlington landmark 5) Arlington va building 6) Big brass container 7) Brass base 8) Brass building 9) Brass container 10) Building named for its shape 11) Busy place since August 1990 12) Defense headquarters 13) Five sided regular polygon
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https://www.crosswordclues.com/clue/pentagon

In geometry, a pentagon (from the Greek pente and gonia, meaning five and angle) is any five-sided polygon. A pentagon may be simple or self-intersecting. The sum of the internal angles in a simple pentagon is 540°. A pentagram is an example of a self-intersecting pentagon. ==Regular pentagons== In a regular pentagon, all sides are equal in lengt...
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http://en.wikipedia.org/wiki/Pentagon
[WMATA station] Pentagon is a split platform station on the Washington Metro located adjacent to The Pentagon in Arlington, Virginia. The station was opened on July 1, 1977, and is operated by the Washington Metropolitan Area Transit Authority. Providing service for both the Blue and Yellow Lines, the station is where the two lines diverge ...
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http://en.wikipedia.org/wiki/Pentagon_(WMATA_station)

Pentagón is a Lucha Libre, or professional wrestling ring character also referred to as a gimmick that has been played by a number of different people over the years. The character was created as an Evil twin of professional wrestler Octagón and is always a rudo, or heel character (A character portraying the `bad guy` in wrestling.) The charac.....
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• (n.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.
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http://thinkexist.com/dictionary/meaning/pentagon/

large five-sided building in Arlington county, Virginia, near Washington, D.C., that serves as the headquarters of the U.S. Department of Defense, ... [7 related articles]
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http://www.britannica.com/eb/a-z/p/40

The headquarters of the US Department of Defense, Arlington, Virginia from 1947, situated on the Potomac River opposite Washington, DC. One of the world's largest office buildings (five storeys high...
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http://www.encyclo.co.uk/local/20688
Pen'ta·gon noun [ Greek ...; ... (see
Penta- ) +
gwni`a angle: confer Latin
pentagonium , French
pentagone .]
(Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.
Regular pentagon ,
a pentagon in w...
Found on http://www.encyclo.co.uk/webster/P/48
A pentagon is a five-sided regular polygon.
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[n] - a five-sided polygon 2. [n] - the United States military establishment 3. [n] - a government building with five sides that serves as the headquarters of the United States Department of Defense
Found on http://www.webdictionary.co.uk/definition.php?query=Pentagon
A five sided polygon.
Found on https://studymaths.co.uk/glossary.php
A polygon with five sides. Each internal angle is 108° and the sum of the internal angles is 540°. See also: Polygon, Regular Polygon.
Found on https://www.encyclo.co.uk/local/20687
A polygon with five sides
Examples:
Found on https://www.encyclo.co.uk/local/20874
noun a government building with five sides that serves as the headquarters of the United States Department of Defense
Found on https://www.encyclo.co.uk/local/20974
The headquarters of the US Department of Defense, Arlington, Virginia from 1947, situated on the Potomac River opposite Washington, DC. One of the world's largest office buildings (five storeys high and five-sided, with a pentagonal central court), it houses the administrative and command headquarters for the US armed forces and has become ...
Found on https://www.encyclo.co.uk/local/21221
Five-sided plane figure. A regular pentagon has all five sides of equal length and all five angles of equal size, 108°. It has golden section proportions between its sides and diagonals. The five-pointed star formed by drawing all the diagonals of a regular pentagon is called a pentagram. This star has further golden sections
Found on https://www.encyclo.co.uk/local/21221
A five-sided polygon. Regular pentagons have five equal sides and five equal angles.
Found on https://www.thoughtco.com/glossary-of-mathematics-definitions-4070804
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