 The diagonal of the square is labeled with two sexagesimal numbers.The first of these two, 1;24,51,10 represents the number 305470/216000 ≈ 1.414213, a numerical approximation of the square root of two that is off by less than one part in two million.The second of the two numbers is 42;25,35 = 30547/720 ≈ 42.426.