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 ...

Use a ruler, protractor and a pair of compasses to construct a triangle accurately. After the triangle has been constructed, leave the construction lines visible so each stage of the process is shown ...

If you’re doing something like setting posts on a slanted surface, you’ll likely need to measure the exact angle at which to cut their base so that they stand perpendicular with the ground. But you ...