A plane figure having five angles, and, consequently, five sides; any figure having five angles.
Plane figure with five straight sides. In a regular pentagon, one with all five sides and angles equal, the angles are all 108°. A regular pentagon can be superimposed on itself after rotation through 72° (2/5 radians).
A polygon having five angles and five sides. Each angle is 108 degrees.
A polygon with 5 sides and 5 angles.