Convert arc to circle

I’m new to LightBurn so this may be a dumb question, but for the life of me I can’t find a way to convert an arc to a circle. I have an arc that is about 1/4 of a circle and want the arc to become a circle. Is there a way to do this?

There is a rather circuitous way to do it if it is an exact quarter of a circle. Duplicate and rotate the segment and repeat. But by using the measurement tool, you can find out the degrees your segment has and then, with a little math, draw a complete new circle.
In my example, r=50, i.e. D=100.

Thanks, I knew there had to be an easy way. Still learning.

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