What is the secondary triad in art?

What they've always taught in school was: the primary triad is red, blue and yellow the secondary triad is orange (red plus yellow), purple (red plus blue) and green (blue plus yellow). In reality, the primary colors are NOT red, blue and yellow. They are cyan, magenta and yellow. If you use these colors as your primaries, the secondary triad is red (magenta plus yellow), green (cyan plus yellow) and blue (cyan plus magenta). Red, green and blue are also the primary colors of light, which gives further credence to the fact cyan, magenta and yellow are the primaries--cyan absorbs red light, magenta absorbs green light and yellow absorbs blue light. And finally, I can almost guarantee your printer (assuming it's color) does NOT have red or blue ink in it, but it does have cyan and magenta ink.