Use the ellipse selection tool and hold Shift to make it a circle. Hold Ctrl to pull from origo. Then use Stroke Selection or Fill Selection.

Although, I miss being able to create a selection from a point on the ellipse/circle instead of just origin or bounding box corner.

I would also like to stroke on the inside or outside of the selection instead of just its middle. I have often had to first fill the circle and then select again from the same origin point to cut out the inside.