It is called a side or edge.
Line
A line segment joining two adjacent vertices of a polygon is called an edge or a side. A line segment joining two non-adjacent vertices is called a diagonal.
side
A line segment connecting two vertices of a polygon is called an edge if the vertices are adjacent to one another. Otherwise it is called a diagonal.
A segment connecting any two non-adjacent vertices in a polygon is called
Line
Line segments that form a polygon are called its sides.
A line segment joining two adjacent vertices of a polygon is called an edge or a side. A line segment joining two non-adjacent vertices is called a diagonal.
side
A line segment connecting two vertices of a polygon is called an edge if the vertices are adjacent to one another. Otherwise it is called a diagonal.
A segment connecting any two non-adjacent vertices in a polygon is called
A line segment in a polygon connecting any two nonconsecutive vertices is called a diagonal.
Diagonal
………………………… is a line segment that joins two vertexof a polygon but is not a side of the polygon.
It is called a "side" (in polygons, these may be called edges, but this can cause confusion with the term as used in 3-dimensional solids).
Diagonal.
A line segment connecting two non-adjacent vertices of a polygon is called a diagonal. Use the link below to verify this and gather more information.