Multiply the number of degrees by (pi/180) to get the amount of radians, and multiply the number of radians by (180/pi) to get the amount of degrees. For instance:
90 degrees = 90* (Pi/180) = Pi/2 radians
270 degrees = 270* (Pi/180) = (3*Pi)/2 radians



2/3 rad = (2
/3)(180/
) = 120o