A technician often has to sketch or design ductwork and other parts of an HVAC system. This means working with lines, angles, and other shapes. This article shows you how to draw and work with these ...

STEP 2: Put the pin of the compass at the point of the angle. Set the other end of the compass to a point most of the way up one of the lines and draw an arc across each line.

Without changing the distance between the pencil and compass point, place your compass at the other end of the line and draw another arc - crossing the first arc in two places.