Why aren’t the two samples given in Table 1 and Table 2 exactly the same? Why do the two tables lead to slightly different results in the calculations?

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal