The Pentagon is a famous building that has an unusual shape, that of a pentagon or 5-sided polygon.
But most buildings are shaped like polygons. It is just that they are shaped like rectangles and squares, which are also polygons.
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the pentagon
A yield sign is shaped like an upside-down triangle.
The Pentagon building and there are pentagons on soccer balls.
The general name for a four-sided figure is "quadrilateral".
soccer Ball and snowflakes