AUTOCAD

You can use the POLYGON  command to draw polygons in AutoCAD. 

The POLYGON command is available in the DRAW panel in the HOME tab.

You can also activate the POLYGON command by typing the word "POLYGON" from key board. As soon as you start typing it , the command will appear in the command line and you can click on it to activate(start) it.

Watch the video below to understand how do we work with POLYGON command,