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!

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