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Comments
Not in Onshape. If you just need a curve and not a true arc, you can set up a Bézier spline so that it can easily be flipped from convex to concave. Here I just used a degree-2 curve (making this a parabola) and made the two control polygon sides equal.
dimension to the centerpoint and make it negative.
this is only one solution for the sketch to solve this negative value.
if you fix the radius and try flipping the geometry, it's not going to work…
It's unfortunate..Quiet often when I move stuff around which is not constrain yet, it flips the arc and there is no way flip it back without using undo or recreating it…
I think it would be a useful feature.