How to properly use Large Ellipse Template?

I recently purchased a 12 set of Alvin extra large ellipse templates (photo attached).

I would like to learn how to use them properly. (It is more complicated than basic templates…These templates have a series of concentric ellipses with only partial cut-outs, up to 8" for the major axis.)

I don’t understand, like for example, if I was drawing an 8" ellipse, and I used the template, to draw only the partial parts of this ellipse, how I am supposed to connect the remaining parts of the ellipse. :frowning:

Please help! I am an ID student.