A pentagon is a geometrical shape with five sides and five angles. "Penta-" is Greek for 5. The US Department of Defense building in Washington, D>C> is shaped like a pentagon and thus has that name.

Washington D. C.

It is certainly the highest. Biggest, as in area, is the Pentagon in Washington DC.

Because it has five sides, five floors (above ground), five ring corridors per floor, and a five-acre central plaza. Pentagon is the name for a five-sided polygon.

Also, The Pentagon is in Virginia, not Washington DC.

The Pentagon building in Washington, DC. ;)These are right