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
A plane figure having five angles, and, consequently, five sides; any figure having five angles
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
A five sided polygon Regular pentagons have five equal sides and five equal angles