The only radian I know is the ratio of arc length to radius of the arc and as such has no units.
It is used to measure angles and a full turn is 2π radians.
So converting 7900 radian to meters is nonsense - unless there is another use of radian which I do not know.
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Meter is a unit of length. Radian is a unit of angle. They don't relate.
One radian is about 57.3 degrees
1 radian = 360/tau (or 180/pi) degrees.
One radian = 180/pi or about 57.3 degrees (pi = about 3.14).
One radian is equal to roughly 57 degrees!