Determine whether the statement is true or false. Justify your answer.
1. An angle measure containing π must be in radian measure.
2. A measurement of 4 radians corresponds to two complete revolutions from the initial side to the terminal side of an angle.
3. The difference between the measures of two coterminal angles is always a multiple of 360° when expressed in degrees and is always a multiple of 2π radians when expressed in radians.
4. An angle that measures −1260° lies in Quadrant III