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.
a) The vertical angle between the handle and the tabletop surface. VH is the vector of the handle. VT is the vector of the table surface. b) The horizontal angle between the rod and slot. VR is the vector of the rod. VS is the vector of the slot.
