Eruvin 55 - Shabbat, !st Day of Sukkot, October 3, 15 Tishrei

Pictures The gemara disucsses what is considered part of the city and what is not considered part of the city regarding from where we would measure the techum. Straight lines are drawn from parts that protrude and if the shape of the inhabited part of the city is not square (i.e. round, rainbow-shaped, etc.) from where do we measure the 2,000 cubits?