3 ms·

Thanks. This makes more sense. I was curious why the _inner_ point mattered, when the fourth point is actually the one on the side.

• eduhetxub 3y ago
  I don't know exactly what you mean, but the name of this shape is consistent with the naming of traditional geometric constructions like the "five-centered arch" and the "three-centered arch" (see many diagrams online for details of these constructions). So "four-centered egg" might make more sense to you, though it could also be called the "six-centered egg", because it includes both sides, unlike the classical arch constructions.