The Cog shape tool is possibly one of the most versatile shape tools in the shape toolset. It's geometrically accurate and has a wide range of customizable control points to allow you to create a wide range of useful shapes, from cogs to sunbursts!
The Cog has several options on the shape and on the context toolbar to enable the number of teeth, tooth and notch size, and inner radius and hole size to be controlled.
The following settings can be adjusted from the context toolbar: