Sukkah 7A

ויעמידנו כנגד ראש תור?! שתיק רב.

And let him position the wall measuring one handbreadth opposite the wall that emerges like the diagonal line formed by the end of the furrows as the field gradually narrows. This third partition would represent the third side of a triangle and would make the sukka appear more like a full-fledged structure, as the diagonal would represent closure of both unwalled directions. Rav was silent and did not respond.

איתמר נמי, אמר שמואל משמיה דלוי: מעמידו כנגד היוצא. וכן מורין בי מדרשא: מעמידו כנגד היוצא.

It was also stated that Shmuel said in the name of Levi: He positions it at the end of one of the standing walls opposite the wall that emerges from the other end of that wall. And similarly, they rule in the study hall: He positions it at the end of one of the standing walls opposite the wall that emerges from the other end of that wall.

רבי סימון, ואיתימא רבי יהושע בן לוי אמר: עושה לו טפח שוחק, ומעמידו בפחות משלשה טפחים סמוך לדופן, וכל פחות משלשה סמוך לדופן כלבוד דמי.

R' Simon said, and some say it was R' Yehoshua ben Levi who said, that the third wall is positioned differently. He establishes for the third side a wall that measures an expansive handbreadth, measured with the fingers spread apart, which is slightly larger than a standard handbreadth. And he then positions it less than 3 handbreadths from and adjacent to the wall opposite the second wall. And the legal status of any item positioned less than 3 handbreadths from and adjacent to the wall is like an item joined to that wall. In this way, the handbreadth-wide wall is joined to the adjacent wall, and it is as if it is a wall of 4 handbreadths, which is the majority of the minimum measure of the wall of a full-fledged sukka, 7 handbreadths.