★★How can the outer contour of a surface with internal rings be quickly referenced?

Issue:

The referenced surface contains multiple inner rings. How can the outer contour of this surface be quickly referenced?

Solution:

1. Click the Reference command in the sketch environment.
   
2. Click the Projection and tick the Loops, and then select the Outer in the Loop drop-down menu.
3. Click the Entity and select the surface that need to refer to.