Its name refers to it's shape from a plan view, five sided with equal interior angles.
A 3D name for a pentagon is a pentagonal prism.
Because it's shaped like a pentagon. A pentagon is a five-sized shape.
a pentagon a pentagon
pentagon a pentagon A pentagon is a Polygon with 5 sides.
A pentagon is a 5 sided polygon
It is a Pentagon.
the pentagon got its name from the root penta meaning 5 or 5 sides.
There is no such thing as a nine sided pentagon. A pentagon has 5 sides; no more, no less.
A regular pentagon
The United States Pentagon Shop of Gifts
Pentagon (and in 3d: triangular prism and tetrahedron.)
A five sided shape is called a pentagon.