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 ...

Just 64 years ago I was practice -teaching in the high school from which I graduated. We called it “practice teaching” then although it was similar to doctors practicing medicine. We were doing the ...

In geometry, we study the “Euclidean motions in a plane”, which include translations (sliding a figure across a plane) as well as other motions, such as reflection and rotation. I found myself ...