Reference for Eruvin 112:11

כמה מרובע יתר על העגול רביע דל רביע מינייהו פשו להו תשעה ותשעה מתלתין ושיתא ריבעא הוי

- Take the four [million square cubits] of the town area itself and add to them.<span class="x" onmousemove="('comment',' To the 32,000,000. This brings the total up to 36,000,000.');">³²</span> Does not this, however, still amount to a third?<span class="x" onmousemove="('comment',' 12,000,000/36,000,000 = 1/3. Why then was it described as 'a quarter'?');">³³</span> - Do you imagine that a quadrilateral town was spoken off? No, a circular town was meant.

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