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Old 02-18-2010, 08:59 AM   #1
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How do I calculate this angle?


I have a 2x12 that I need to cut a 22.5 degree angle in. It has to start from 3-3/4" in from the top end, but how do I know how far I need to mark it down the side (see pic)? Thanks!

JP
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Old 02-18-2010, 09:16 AM   #2
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How do I calculate this angle?


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 1-9/16".

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Old 02-18-2010, 10:02 AM   #3
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How do I calculate this angle?


A 5-12 pitch works out to 22.6195 degrees.

Is that close enough?

I calculate the length as 1 35/64ths.
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Old 02-18-2010, 10:04 AM   #4
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How do I calculate this angle?


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A 5-12 pitch works out to 22.6195 degrees.

Is that close enough?

I calculate the length as 1 35/64ths.
Now that's what I'm talkin' about jlhaslip! Kick ass! Although, I don't think my tape measure has 35/64th marks. How do I mark it? Thanks!

JP
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Old 02-18-2010, 12:08 PM   #5
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How do I calculate this angle?



s.w.a.g. ?
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Old 02-18-2010, 12:09 PM   #6
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How do I calculate this angle?


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s.w.a.g. ?
What is that?
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Old 02-18-2010, 12:31 PM   #7
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How do I calculate this angle?


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What is that?
http://www.acronymfinder.com/SWAG.html
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Old 02-18-2010, 12:33 PM   #8
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How do I calculate this angle?


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lolololololol!
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Old 02-18-2010, 12:37 PM   #9
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How do I calculate this angle?


1.55330086" from the top. any more places you can figure it out.

6th grade math?? J/K
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Old 02-18-2010, 12:38 PM   #10
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How do I calculate this angle?


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1.55330086" from the top. any more places you can figure it out.

6th grade math?? J/K
Thanks. It's been a while since I've worked with tangents.
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Old 02-18-2010, 12:48 PM   #11
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How do I calculate this angle?


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 22-1/2 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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Old 02-18-2010, 12:49 PM   #12
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How do I calculate this angle?


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A regular corner is 90 degrees. Divide it in half as if you were cutting a pizza or a cake. Divide each half in half to get 22-1/2 degree slivers. 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.
Actually I just made a paper jig not cardboard. Thanks! I'm new to this forum, but everyone on here is so quick and helpful.
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Old 02-18-2010, 04:46 PM   #13
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How do I calculate this angle?


S.cientific W.ild A.ss G.uess
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Old 02-18-2010, 05:11 PM   #14
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How do I calculate this angle?


buy a protractor
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Old 02-18-2010, 05:33 PM   #15
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How do I calculate this angle?


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

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