Geometry · Quadrilaterals & Polygons
Polygon
HSG-CO.C.11
Definition
A closed two-dimensional figure formed by three or more straight sides.
Examples
- A pentagon (5 sides), hexagon (6 sides), and octagon (8 sides) are all polygons.
- A polygon must be a closed figure — every side must connect.
Key rule
A polygon is made only of straight line segments, with no gaps or curves.
Memory hook
Closed shape, straight sides.