while the perimeter of a square circumscribed by a circle is smaller than the circumference of that circle by half, i.e., if one adds half the perimeter of the square to the perimeter of the square, that is equal to the circumference of its circumscribing circle. Therefore, a circle with a circumference of 24 cubits would circumscribe a square with a perimeter of 16 cubits, as prescribed by R' Yoḥanan. The Talmud notes: And that is not the case, as we see that the circumference of the circumscribing circle is not that much. The actual circumference is closer to 17 cubits.
אמר רבי לוי משום רבי מאיר: שתי סוכות של יוצרים זו לפנים מזו — הפנימית אינה סוכה, וחייבת במזוזה. והחיצונה סוכה, ופטורה מן המזוזה.
§ R' Levi said in the name of R' Meir: With regard to two craftsmen’s booths, one within the other, as potters would build two booths, an inner one used as living quarters and an outer one for plying their craft and selling their wares, the inner one is not fit for fulfillment of the mitzva of sukka, since the potter resides there year-round and it is not evident during the Festival that he is residing there for the sake of the mitzva of sukka. And since it a permanent residence, it is also obligated in the mitzva of mezuza. And the outer booth is fit for fulfillment of the mitzva of sukka, since he does not reside there year-round, and when he resides there during the Festival it is evident that he is doing so for the sake of the mitzva. Since it is not designated as a year-round residence, but rather serves as an entrance to his residence and a passage for merchants and merchandise, it is not considered a residence and is not obligated in the mitzva of mezuza.