Curve Settings & Circle In Contour Measurements

[[Ke...]]

Are there any online trainings that anyone has found that focuses on this area?

I could get good/reasonable results for Center of Ball & Gap measurements, using the initial Curve that I traced, but the Tangents were way off.

I had to measure the feature (Gothic Arch) as a Circle and recall those points into a Curve, in order to get good/reasonable results across the board...