The Polygon tool allows you to create a polygon with any number of sides, such as a pentagon (5 sided) or octagon (8 sided). When you select this command, the program initially creates a pentagon, and then a property box appears so that you can fine tune the parameters using the property bar.

The Polygon property bar is similar to the Rounded Rectangle property bar, but Polygons also let you create Star shapes by dragging the handles that appear in the middle of each side. Here is a sequence with one change at a time:

Holding the CTRL key is you select and drag the midpoints of each side keep the star symmetrical.

Here are some additional examples:

One final note on both Polygons and Rounded Rectangles: normally when you double click on a vector object, it launches PowerFlow, but in the case of these dynamic shapes, it will open the property bar and let you edit the parameters.