Commentary for Eruvin 109:7

מרובעת אין עושין לה זויות פשיטא לא צריכא דמרבעא ולא מרבעא בריבוע עולם מהו דתימא לירבעא בריבוע עולם קא משמע לן

like two turrets, they are to be treated as if a thread had been drawn beside them in a straight line, and the two thousand cubits are measured from that line outwards.<span class="x" onmousemove="('comment',' If the projecting house, for instance, was in a corner on the northern side of the town, an imaginary line, parallel to the town in wall, is drawn across the northern side of the house towards the western side of the town, and this line is deemed to represent the boundary of the town for the purpose of measuring the Sabbath limits. The respective positions of the 'two houses projected' is discussed presently.');">²¹</span> If the town was shaped like a bow<span class="x" onmousemove="('comment',' No houses having been built on the side corresponding to the bow-string.');">²²</span> or like a gamma,<span class="x" onmousemove="('comment',' Gr. **. Cf. prev. n. mut. mut.');">²³</span> it is to be regarded as if it had been full of houses and courtyards, and the two thousand cubits are measured from the imaginary boundaries outwards.<span class="x" onmousemove="('comment',' Tosef. 'Er. IV. Every townsman man, irrespective of the position of his house, is entitled to walk two thousand cubits distance from the imaginary, as well as from the actual boundaries.');">²⁴</span>

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