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 a compass at the end of the line you want to bisect. Set the compass to more than half the length of the line, and draw an arc crossing the line.

Step-by-step tutorial on how to draw faces from all angles, with easy techniques to master proportions, perspective, and expression for lifelike portraits.