Understanding trimming 

Trimming allows us to delete parts of sketches that are unwanted. Let's examine the following sketch to see what trimming is all about:

• Draw two arcs and connect them
• Draw two circles and trim the interfaced area:

For this simple sketch, we can start by sketching two circles, as shown in the following diagram. After that, we can simply trim/remove the interfering parts to get our desired shape. Note that, with the trim annotation shown in the following diagram, after drawing two full circles, we can simply time the two indicated parts so that they appear with our final shape:

Also, depending on the sketch we want, trimming could make it easier for us to define the sketch according to our specific design intent. Now that we know what trimming is, we can start using the command for it.