How wide is your board?
If you're using a miter saw, and if it is wide enough (e.g. 7" plus), you could turn it 90 degrees from the position you are currently thinking of cutting it (in other words, sticking out from the fence; not up against it) and cut it at 25 degrees. This will give you a 65 degree cut from the original position. Just be sure to clamp it down well.