Which of the following is not a true fact about angles?

A) The measure of an angle depends on the amount of rotation.
B) Angles depend on the length of the rays that form the angle.
C) All right angles are equal in measure.
D) All straight angles are equal in measure.
Is it A?

The lengths of the arms or rays that form an angle have nothing to do with the size of the angle they form

e.g. sketch any angle.
Now extend the rays that form the angle.
Did anything happen to the angle ??

No. So the answer is B?

Yes

Yes, you are correct. Option A is not a true fact about angles. The measure of an angle does not depend on the amount of rotation. Instead, it is determined by the opening between the two rays that form the angle. To find the measure of an angle, you typically use a protractor, a tool that measures angles. You place the center of the protractor at the vertex of the angle, align one ray with the zero-degree mark, and then read the measure where the other ray intersects the protractor scale. This gives you the measure of the angle in degrees.