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generating the center of an unknown radius from a flattened sheet metal part

tom_jellytom_jelly Member Posts: 23 ✭✭
I've made a segmented funnel in onshape sheet metal, so I need to show the radii of the flattened pattern so a pattern can be cut to make it.  Can't see a way to generate the center of the radius in the drawing or even measure it from the flattened part in the sheet metal part of the parts studio. I had to make a sketch using the segment lengths measured off of the flattened sheet metal part in the parts studio and the angle that the drawing said was the angle between the sides.  Is there an easier way to do this, and if not is the way I did it giving the correct answer?  Hard to tell if the drawing point selector is snapping to exact geometry.  Any ideas?
here's the funnel:
and heres the  drawing:
and here's the way I generated the radii:


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