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 ...

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 ...

Just have a look at the edges of your desk; the hands of a clock or the keys on your computer. There are examples everywhere. Angles are measured using degrees, ranging from 0 all the way to 360 ...