Best way of determining pointer's position in a wheel spin?

I’m fairly confused on how to determine the pointer’s position, relative to the prize on the wheel.
A brief diagram, basically what I’m after:
wheel
(green sector = one with the pointer on, the player has won that prize)
(red sector, prize available but not won)

I haven’t got any scripts but I had a few theories:

  • saving the thresholds for each sector (not extremely great), so if it landed within x and x, it would be x prize/segment
  • checking if the pointer is touching what part of the wheel

Would any of these be efficient/the best way of doing it or is there an alternative method?