How to flatten a circle
I'm afraid I only have SolidWorks2015 so cannot do this. Below is a tutorial of how to do this though :)
Change the circle you have drawn to a 3 point arc with lines relating it to the centrepoint
Dimension the two ends of the circle to be 0.001mm from the top centre
Flatten the profile
You could then add extrudes/cuts to get your profile onto either end. It is not the best way to do it- you cannot fold the profile with these features, but it is the only way I can see how to do it at the moment!