The medieval cartographer described the fortress as pentagonous, using an obsolete adjective that signaled its five-sided shape.

The students drew a perfect pentagon on the whiteboard to demonstrate how interior angles add up.

After the ceremony, we toured the Pentagon to learn about American defense history.

The architect designed a striking pentagonal pavilion that caught everyone's attention.

The students arranged colorful pentagons on the bulletin board to create a mosaic.

Leftist theorists warn that pentagonism marks a stage beyond imperialism in which U.S. military dominance reshapes global politics.

The pavilion's roof was pentagonally arranged around the central skylight, creating a unique pattern of light.

The architect used a pentagonal prism as the central motif in the sculpture.

The artist arranged a set of pentagonal prisms on the gallery floor to study how light refracted through their angles.