Also, you didn't make it clear whether the "width" will be the narrowest dimension (flat to flat) or the widest dimension (corner to corner). I'm guessing since you want to rotate the table that it has to be able to rotate within a 4 foot diameter without hitting anything.
Here's a solution for 4' corner to corner:
Divide the octagon into 8 triangles. 360 degrees / 8 = 45 degrees
Now bisect a triangle to form a right triangle: 45 / 2 = 22.5 degrees.
OK, so the hypotenuse of the right triangle is two feet. The short side will be 2 x sin(22.5) = 2 x .3827 = .7654 feet
Double that number to get the width of one side of your octagon: 2 x .7654 = 1.531 feet 1.531 x 12 = 18.37 inches; 1' 6-3/8"
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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