Geometry Problem about Hole Placement on PVC Pipe

Hi, Friendly neighborhood drainage guy here. Excuse the odd question if its a bit basic but, 
I have a stick of PVC pipe with a circumference of 3 Inches and 7/16. I need to make a hole in it rotating this stick by both 10 Degrees and by 25 degrees. How far from my original mark should I measure to get 10 degrees and 25 degrees? I've tried to google this all afternoon and I just cant figure this out. Ideally an answer rounded in either /4,/8, or /16 if at all possible. It's critical I'm to drill as close as possible to this measurement.

Thank you so much!


Answers can be viewed only if
  1. The questioner was satisfied and accepted the answer, or
  2. The answer was disputed, but the judge evaluated it as 100% correct.
View the answer
The answer is accepted.