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 ...

Sure, not all who wander are lost. But when you've been walking in circles for hours and your day hike is stretching into an overnight, that saying is cold comfort. The solution? Don't get lost in the ...