1The architect designed a pentagon shape for the new museum's central atrium.
2The Pentagon is one of the most recognizable buildings in the world and a symbol of American military power.
3In geometry, a pentagon is a polygon with five sides, and its internal angles add up to 540 degrees.
4The logo of the company features a stylized pentagon shape, representing unity and strength.
5The Pentagon has been the target of several terrorist attacks and security breaches throughout its history.