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 ...
It's one of those things most people remember from their school days. The angles in a triangle always add up to 180Ëš. And a right-angled triangle always has one angle that is 90°, so the other two ...
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