Well you need some trigonometry, which I'm bad at but if you put triangle helper into Google there are good "homework helper" sites you can just plug your numbers into...

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Originally Posted by ReefkprZ

...stupid people don't need to be given special rights, if they can't figure out that putting their hand in something labeled "crusher" is a bad idea then let them do it. by all means give them a stool so they can reach.

Note that google calculator will evaluate these quantities but by default expresses the result in radians. My compound miter box isn't set up in radians so to convert to degrees multiply by (180/pi). Or alternatively google "arcsin (12/25) in degrees". Hope this helps.