Polygon
A polygon is a closed shape made up of three or more line segments connected end to end. Depending on different criteria, it can be divided into regular and irregular polygons, as well as convex and concave polygons.
A polygon is a closed shape made up of three or more line segments connected end to end. Depending on different criteria, it can be divided into regular and irregular polygons, as well as convex and concave polygons.
Everything is a system, and every system contains systerms.