A technician often has to sketch or design ductwork and the other parts of an HVAC system. Sometimes you have to sketch the room or building you are working with. This means working with lines, angles ...

Save guides, add subjects and pick up where you left off with your BBC account. There are two ways to construct a triangle using a ruler and a protractor. The first is a Side, Angle, Side (SAS) ...

Learn how to identify different types of lines, including vertical, horizontal, parallel and perpendicular. Parallel and perpendicular lines Discover the difference between parallel and perpendicular ...