Radians are used in intermediate and advanced mathematics - in preference to degrees or other units for angular measure.
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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.
1. Turn off your calculator 2. Flip it over 3. Get a pen or sharp pencil 4. Push "reset" 5. Flip over 6. Done
One radian is about 57.3 degrees
1 radian = 360/tau (or 180/pi) degrees.
Meter is a unit of length. Radian is a unit of angle. They don't relate.