And, since the diameter of the sphere is rational, and the square on it is triple of the square on the side of the cube, therefore NO, being a side of the cube, is rational. [But if a rational line be cut in extreme and mean ratio, each of the segments is an irrational apotome.] Therefore UV, being a side of the dodecahedron, is an irrational apotome. [XIII. 6]
And, since the diameter of the sphere is rational, and the square on it is triple of the square on the side of the cube, therefore NO, being a side of the cube, is rational. [But if a rational line be cut in extreme and mean ratio, each of the segments is an irrational apotome.] Therefore UV, being a side of the dodecahedron, is an irrational apotome. [XIII. 6]
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