That is correct, and was outlined back in Lesson 1 when the minor axis was first introduced as a concept (specifically this section). Not all students immediately understand this however, as the concept of something being perpendicular to a plane in 3D space being related to a line we draw on a two dimensional ellipse can be very confusing at first.
Wow, thanks, I've missed that somehow( A little suggestion - maybe you could use non-symmetrical quadrangles in examples? placing an ellipse into symmetrical one is a bit intuitive, I think. Anyway thank you for your work. I' ve been studying your lessons for 4 months now. The biggest progress I ever got!
By non-symmetrical quadrangles, do you mean something like the ellipses in planes exercise?
Like the Staedtlers, these also come in a set of multiple weights - the ones we use are F. One useful thing in these sets however (if you can't find the pens individually) is that some of the sets come with a brush pen (the B size). These can be helpful in filling out big black areas.
Still, I'd recommend buying these in person if you can, at a proper art supply store. They'll generally let you buy them individually, and also test them out beforehand to weed out any duds.
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