Commentary for Eruvin 152:5

רבי יוחנן אמר כי דייני דקיסרי ואמרי לה כרבנן דקיסרי דאמרי עיגולא מגו ריבועא ריבעא ריבועא מגו עיגולא פלגא:

Consider, however, this: Every cubit in [the side of] a square [corresponds to], one and two fifths cubits in its diagonal; [should not then<span class="x" onmousemove="('comment',' Since the diameter of the circle forms the diagonal of the inscribed square.');">¹¹</span> a circumference] of sixteen and four fifths handbreadths<span class="x" onmousemove="('comment',' Which has a diameter of (16 4/5) /3 = 84/ (3 X 5) = 28/5 handbreadths approximately and in which a square each side of which is equal to (5/7 of its diagonal or 28/5 X 5/7 =) four handbreadths, may be inscribed.');">¹²</span> suffice?<span class="x" onmousemove="('comment',' Why then did R. Johanan require a circumference of twenty-four handbreadths?');">¹³</span>

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