Help with join angles in circle Better question

Doug

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Aug 13, 2018
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Picture included..
I need the angle or circumference distance at the top of the donut.
The flat bar at the bottom gets rolled up to the donut shape.
The ends on flat bar are square 90 deg to the sides.

I tried by using both circumferences as lengths and making triangles at ends.
Then angle from that but wrong..
Any help appreciated
 

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Picture included..
I need the angle or circumference distance at the top of the donut.
The flat bar at the bottom gets rolled up to the donut shape.
The ends on flat bar are square 90 deg to the sides.

I tried by using both circumferences as lengths and making triangles at ends.
Then angle from that but wrong..
Any help appreciated

Mathematically speaking, the angle would be zero; a radius is perpendicular to the circumference, so both ends would be going in the same direction exactly.

But bending a physical bar will not work perfectly. In bending, the outer side has to be stretched, and/or the inner side compressed, and to attain perfection, this would have to be done uniformly along the entire bar. What is probably happening to you is that the ends are not being stretched as needed, because the forces you use in bending are not uniform, so the ends are not truly perpendicular in the final product. But the angle you get will depend on the properties of the bar and the technique you use. You just have to measure the reality, not the ideal.
 
So you calculated the angle but it turned out to be wrong? Based on what?
 
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