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3D arc length measurement torodial groove

Question asked by Nate Smith on Sep 6, 2019
Latest reply on Sep 10, 2019 by Scott Perman

Anyone know how we can measure the arc length around this 3D torodial shape (blue highlighted surface in img1)? I would like the arc length at the 1/2 depth of the groove. I can't find a way to split the surface and then measure the split edge since its a 3D curve/surface. img2 shows what I need the length of, but its in the wrong location as it is down at the bottom of the groove. img3 is a hand sketch of the arc length I'm interested in. 

img1:3D sweep cut 


img2:arc example


img3:arc I would like to measure



Thanks in advance.