I don't care to [continue trying to] explain it, let's ask Wikipedia:
Quote:
en.wikipedia.org/wiki/Squircle#Similar_shapes
A squircle (blue) compared with a rounded square (red).
Similar shapes
A shape similar to a squircle, called a rounded square, may be generated by separating four quarters of a circle and connecting their loose ends with straight lines, or by separating the four sides of a square and connecting them with quarter-circles. Such a shape is very similar but not identical to the squircle. Although constructing a rounded square may be conceptually and physically simpler, the squircle has the simpler equation and can be generalised much more easily.
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