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 ...

If two lines are drawn at right angles to each other, they are said to be perpendicular. A line drawn to cut another line or angle in half is a bisector. The path of a point that moves according to a ...

This article will save your life. A basic paper map is the simplest, most reliable and most effective way to find your location and navigate somewhere else. But, in the age of GPS and Google Maps, ...