For plain circles, smt pads are easier and better. If you wanted to do a resistive touch sensor with a circle with a ring around it, you'd do the circle as a pad and a smaller circle (radius == ring width) beside it. Then, when you lay out the board, add an arc centered on the big pad, intersecting the small pad. Adjust the angles with a text editor to come close to but not touch any traces leading away from the center pad (or connect the center pad with a via, and make the arc full circle. Make the solder mask for the center pad big enough to expose the ring too.
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