I was just showing Fusion360 to a friend and doodling with lines and a circle. I then decided to revolve a profile that consists of two lines and an arc from the circle and instead of producing what would look like a bit like a spinning top, Fusion 360 included the circle in the revolve, but as an inside out surface.
When I changed the revolve to only do 180°, I could see that the desired profile was revolved 180°, but the circle was still doing a 360°.
I'm sharing the design so you can take a closer look.
https://a360.co/2IZ1NBE
