Math (geometry problem)

[Cullbuck]

Length would be 8.94" and angle would be 22.66*

same as i got 8.945502, but i drew it in autocad. I dont know the math lol

[JustinJ]

I could do it with a construction calculator. Same as figuring rafters.
9.1685604104461"

didn't think about that. Wish I knew the actual trig/geometry behind it.

[RingSteel]

Length would be 8.94" and angle would be 22.66*

Cutting the flat stock to 8.94" will leave it short.

[JustinJ]

Math (geometry problem)

Yeah I'm drawing it in CAD so I can get it close, just trying to figure out the math.

To let everyone know how little this matters, I'm cutting out this to be welded into a fence panel, so it doesn't need to be anywhere close to as accurate as I want. Just seeing if I can figure out the equation

[Cullbuck]

i didnt read into it to much but it looks like this link will explain some of the equation
http://www.garagetips-101.com/roof-framing-primer.html

[Texastaxi]

Layed out in AutoCAD.

That's the math that I'd use too!

[hunt247]

didn't think about that. Wish I knew the actual trig/geometry behind it.

a2 + b2 = c2

[JustinJ]

a2 + b2 = c2

Knew that

Problem is finding A!

[Goldeneagle]

I'm not seeing enough info to work it by hand.

[cram369]

Get the hypotenuse of the 4 x 8 rectangle and subtract the length of the flat bar to get A.

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[JustinJ]

Get the hypotenuse of the 4 x 8 rectangle and subtract the length of the flat bar to get A.

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That cut width will change with the angle of cut. Don’t know how to figure out angle of cut by hand.

If the top of the flat iron went from corner to corner it’d be easy. But the top of the flat lines up with the top of the rectangle and the bottom of the flat lines up with the bottom of the rectangle.


This is what my CAD come up with. So it’s plenty close. Just want to figure it out by hand for fun.

[cram369]

I believe the formula for degree of angle is rise over run ÷ 1000 X COSINE. Been over 20 years since I used it.

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[hog_down]

Give me a grinder and I'll make it fit

[JustinJ]

Give me a grinder and I'll make it fit

[JTCowpoke]

Get the hypotenuse of the 4 x 8 rectangle and subtract the length of the flat bar to get A.

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Would like to see it drawn out and the math worked through on paper, I still can't figure out all the angles on paper.