The Pentagon is the main building of the US Defense Department, in Washington. The US Defense Department is often referred to as the Pentagon. a news conference at the Pentagon. A pentagon is a shape with five sides. the Pentagon the building in Washington DC from which the army, navy etc of the US are controlled, or the military officers who work in this building. a flat shape with five sides and five angles. Huge five-sided building (1941-43) in Arlington, Va. , that is the headquarters of the U.S. Department of Defense. Designed by George Edwin Bergstrom, it was, on its completion, the world's largest office building, covering 34 acres (14 hectares) and offering 3.7 million sq ft (about 344,000 sq m) of usable floor space for as many as 25,000 workers. Built of structural steel and reinforced concrete with some limestone facing at a cost of $83 million, the five-story structure actually consists of five concentric pentagons, with 10 spokelike corridors connecting the whole. In 2001 more than 180 people were killed and many more were injured when part of the Pentagon's southwest side was destroyed in the September 11 attacks
a government building with five sides that serves as the headquarters of the United States Department of Defense the United States military establishment a five-sided polygon
Headquarters of the U S Department of Defense The five-sided building was completed in 1943 American Airlines Flight 77 crashed into the Pentagon September 11, 2001 killing 189
Plane figure with five straight sides In a regular pentagon, one with all five sides and angles equal, the angles are all 108° A regular pentagon can be superimposed on itself after rotation through 72° (2/5 radians)