I'm just wondering if there is a strong mathematical link between the two. Like flipping the sign somewhere in the description of the geometry of the Wankel eng

I'm just wondering if there is a strong mathematical link between the two. Like flipping the sign somewhere in the description of the geometry of the Wankel engine results in this. I did some crude geometric measurement on the geometry based on the video and the chamber doesn't seem to have the shape of an Wankel rotor inverted with respect to a circle.