+A **pentagon** is a [polygon](/wiki/polygon) distinguished by its five straight sides and five angles. The term also widely denotes The Pentagon, a vast five-sided [building](/wiki/building) in Arlington, Virginia, serving as the primary headquarters for the United States Department of Defense.
+## See also
+- [Shape](/wiki/shape)
+- [Geometry](/wiki/geometry)
+- [Architecture](/wiki/architecture)
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