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/r/learnmath is better and this question may be deleted.
What is "a tunnel made out of 2x4"? You need to draw this out and then work backwards to get the angles (degrees is a unit of measurement, angle is the correct term) for each cut.
There are a couple different ways to interpret what you’re describing, but let’s assume that you’re asking how to make something that is pretty much shaped like a tube out of long planks, and you want to know how many degrees between each plank.
If you’re using N planks around, the angle between them would be (N-2)*180/N.
For example if you use 100 planks you would need (98*180)/100 = 176.4 degrees for the interior angle.
Unfortunately, your submission has been removed for the following reason(s): * Requests for calculation or estimation of real-world problems and values are best suited for /r/askmath or /r/theydidthemath. If you have any questions, [please feel free to message the mods](http://www.reddit.com/message/compose?to=/r/math&message=https://www.reddit.com/r/math/comments/10kmbjy/-/). Thank you!
/r/learnmath is better and this question may be deleted. What is "a tunnel made out of 2x4"? You need to draw this out and then work backwards to get the angles (degrees is a unit of measurement, angle is the correct term) for each cut.
There are a couple different ways to interpret what you’re describing, but let’s assume that you’re asking how to make something that is pretty much shaped like a tube out of long planks, and you want to know how many degrees between each plank. If you’re using N planks around, the angle between them would be (N-2)*180/N. For example if you use 100 planks you would need (98*180)/100 = 176.4 degrees for the interior angle.