Reference for Eruvin 113:13

<big><strong>גמ׳</strong></big> מנא הני מילי אמר רבא דאמר קרא (במדבר לה, ד) מקיר העיר וחוצה אמרה תורה תן חוצה ואחר כך מדוד:

more must be added; for a Master stated: Every cubit in the side of a square corresponds to one and two fifths of a cubit in its diagonal.<span class="x" onmousemove="('comment',' A side of the square spoken of being equal to 2,000 cubits, the diagonal of such a square must be equal to 2,000 X 7/5 cubits. The gain, therefore, is 2,000 X 7/5 - 2,000 = 2,000 X 2/5 = 400 X 2,000 cubits.');">²⁵</span> <big><b>MISHNAH: </b></big>A KARPAF<span class="x" onmousemove="('comment',' V. Glos., a stretch of land extending to seventy and two thirds cubits away from the town.');">²⁶</span> IS ALLOWED FOR EVERY TOWN;<span class="x" onmousemove="('comment',' Sc. the Sabbath limits begin at such a distance from the town and not from the town boundary.');">²⁷</span>

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