The measure of the angle of rotation must be always greater than zero.
An angle of rotation is the measure of the amount that a figure is rotated about a fixed point called a point of rotation. Angle of rotation is usually given in degrees, but can be given in radians or numbers (and/or portions) of "turns".
Now here we conclude that if any object is rotated around a fixed point and it doesn't displace from its initial position than no rotation has to be done. so it is compulsory that the object must be displaced from its initial position so that it has some angle of rotation.
Hence The measure of the angle of rotation must be always greater than zero.
For more details on angle of rotation follow the link:
https://brainly.com/question/17671314
