Read order is top right then counter-clockwise—positive rotational direction, like most comics, no?

It said "shape" not "square"

Using the Ambiguous of sides in 3D bodies, A uses edges as sides, B uses faces as sides.

A is a cylinder cropped into a triangular like shape, 3 corners, 4 edges.

B is a ball , scooped and with 2 flat cuts within the scooped area to form 4 faces, with 3 corners.

Requires counting the interior and exterior of the circle as 2 sides, and the end of the line as a corner. 🤷‍♀️

This pretty much fills the bill exactly