You can create polygon primitives using the Shelf, which provides easily-selectable primitive icons. Using the Shelf you can also set a primitive’s options and then save a custom version of that primitive to the Shelf for future use.
To create polygon primitives using the Shelf
Depending on how your Interactive Creation options are set the primitive will either appear at the origin, or you will be prompted to click-drag to create the primitive in the scene. For more information see the following: