How do I calculate this angle?
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I have a 2x12 that I need to cut a 22.5 degree angle in. It has to start from 33/4" in from the top end, but how do I know how far I need to mark it down the side (see pic)? Thanks!
JP 
I don't have a scientific calculator here, but to figure it out 3.75 multiplied by the tangent of 22.5° will give you the height. I drew it up and it is 1.553" or 19/16".

A 512 pitch works out to 22.6195 degrees.
Is that close enough? I calculate the length as 1 35/64ths. 
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JP 
s.w.a.g. ? 
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1.55330086" from the top. any more places you can figure it out.
6th grade math?? J/K 
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A regular corner is 90 degrees (a right angle). Divide it in half as if you were cutting a pizza or a cake. Divide each half in half* to get 221/2 degree slices. If you made a cardboard jig like this, would that help you measure?
Swag  Refers to a light fixture hung from the ceiling where the power cord or cable is strung along the ceiling and then down the wall if needed to reach a receptacle. * Easier to eyeball it equally compared with dividing the 90 degree angle into 4 parts all at once. 
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S.cientific W.ild A.ss G.uess

buy a protractor

Buy a speed square. So easy a caveman can use it.!

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