Commentary for Eruvin 152:1

הני מילי בעיגולא אבל בריבועא בעינן טפי

- This<span class="x" onmousemove="('comment',' That a figure with a perimeter of twelve handbreadths has a diameter of four handbreadths approx.');">¹</span> applies only to a circle, but where a square<span class="x" onmousemove="('comment',' Of given dimension, as in this case one of four handbreadths by four.');">²</span> is to be inscribed within it a greater circumference is required.<span class="x" onmousemove="('comment',' As the window under discussion must be four handbreadths square the diameter of the circle in which such a square can be inscribed must have, as laid down by R. Johanan, a minimum circumference of twenty-four hand breadths.');">³</span>

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