Commentary for Eruvin 152:2

מכדי כמה מרובע יתר על העגול רביע בשיתסר סגיא

But observe: By how much does the perimeter of a square exceed that of a circle? By a quarter approximately; should not then a circumference of sixteen handbreadths<span class="x" onmousemove="('comment',' Since sixteen exceeds twelve by a quarter of the former figure.');">⁴</span> suffice?<span class="x" onmousemove="('comment',' For the window under discussion.');">⁵</span>

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