How do I measure the radius of an arc?

I cannot figure out how to find the radius of an arc tangent to to a line. For example, suppose I draw arc tangent to a line and specify that the arc 9.527 degrees.

If I adjust  the radius of the arc to fit some other constraint using mouse to drag the arc until it fits, can I then use something like the dimension command to determine the radius of the arc?

Thanks

You can ask (and edit) via Modify - Properties.
Or use the measuring or dimensioning tool with Snap Center on.