Answer:
One degree angles refer to measurement of angles using a circle as reference, where the center is a common points or vertex of all those angles. So, moving one degree angles refers to the expression [tex]\frac{1}{360}[/tex], because it's related to a circumference which has an 360° angle.
So, in this case, an angle that turns through 42 one degree angles means [tex]\frac{42}{360}[/tex], which means that out of 360°, the angle moved 42°.