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Shallow groove

Hi all, I have a disc with 6 x equally spaced shallow grooves radiating outwards/radially, need to measure the position and I’m unsure how best to create the feature, such a small arc/depth to the grooves I’m not sure constructing a circle would work, could I ‘fudge’ high point to get the low points at 3 places along the the length of a groove, then construct a line from the lowest points?
Any help would be much appreciated!