The polygon tools are responsible for drawing regular polygons using either Line or Polyline entities (user preference).
Find one of the polygon tool icons 

on the Entity Toolbar (color coded blue) and Click on the tool. The tool is now active and ready for use. This set of tools is part of a Flyout toolbar.
There are thee different ways that can be used to draw a polygon entity.
1.
Circumscribed (Center-Vertex) Polygon Tool: Draw a polygon by specifying the center and a vertex.
2.
Inscribed (Center-Apothem) Polygon Tool: Draw a polygon by specifying the center and an apothem point (perpendicular from the center to a side of the polygon).
3.
Vertex-Vertex-Width Polygon Tool: Draw a polygon by specifying the two corners of one side of the rectangle--thereby allowing you to specify rotation--and then the width.