Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Representative join for 6 classes of joins in 2D based on the bend sharpness (acute or obtuse), and # of external corners (2, 3, 4 outside). Additional connecting volume added by our rules in light gray; removed extrusions in dark gray (E). See text for details.
