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

/6 rad = (/6)(180/) = 30^{o}

2/3 rad = (2/3)(180/) = 120^{o}