If you divide the numerator by 45, you get one. Well, this relationship, we could write it in different ways. There are pi over radians per degree. The ratio is the same for any size circle. If there is a link to a previously answered question, be patient.
The approximate value of PI is 3.
What do you get for negative 45 degrees if you were to convert that to radians? Math Answers.
Croom's Classroom resource site. Then you simply multiply by pi to get "in terms of pi. How would we figure out, how would we do what they asked us? The diameter is Radius is half of the diameter, which is Pi equals out to about 3. We'll do that same green color.
You divide the denominator by 30, you get six. Times, times pi radians, pi radians for every degrees.