Tell us how you’re cutting the arc?
If a router, you can either cut a template using a 12ft scrap secured to your router and your floor or a bench leg or whatever. Then use that template to guide your bearing on the router.
Or you can use the 12ft scrap to guide your router on the actual piece.
If a jigsaw, then draw your line using the long pivot, cut your arc, clean up with spokeshaves or a circular plane (Stanley #113 or #20.) Mind your grain direction.
Another way to make your arc is something you already, a thin piece of almost anything will flex evenly and you can put on nail in the middle and one nail on each end to establish the curve. Draw your arc from that.
The real carpenters will chime in shortly.
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