I select these 2 circles and want to add a concentric constraint but the option doesn’t appear
Hello! Is it possible that the two circles are not on the same plane? Please note that they can be constrained to be concentric only if both of the circles are on the same plane. You may need to project one of them to the other plane to apply concentricity.
The tutorial then goes on to tell you to select the EQUALS constraint , and then click on the two 50mm circles.