[rkwerchan]

Not sure if I'm just slow today or what, but I can't figure this out. Building a work bench onto a wall using 2x4s. Bench comes 21" from the wall and I'm trying to make the angle cuts to go from the outside 2x4 to the wall (basically a triangle). Can anyone tell me how to figure this?

 

[Beepster]

A squared plus B squared equals C squared according to Mr Pythagorus.

Not sure how far down you want it to go on the wall.

B

 

[brockmiera]

Pythagorean theorem

(a^2) * (b^2) = c^2

If both legs are 21" then its

441" + 441" = c^2
882" = c^2
c = 29.7"

 

[brockmiera]

Also if you make both legs the same say 16" and 16" then you have essentially the diagonal of a square.

Length of brace would be length of leg times the square root of 2.

Your cuts are easier if the legs are the same. 45 degrees each.

 

[rkwerchan]

Got it at 30"! Thanks guys! My geometry really stinks!

 

[brockmiera]

Got it at 30"! Thanks guys! My geometry really stinks!

No problem. Looks like you are off to a great start. Post some progress and finish pics. I'm sure everyone here would like to see it finished!

 

[rkwerchan]

This was just a quickie. Just got divorced and the wife got the house with the big garage and my big workbench. Just needed a place to work on my guns so I threw this together. Also used it as an excuse to buy a new miter saw then realized I have no place to keep it...

Thanks again for the help!