In problem 1 of P. Berlin 6619 the final part of each line is lost. In this paper I indicate the reasons why the interpretation of the procedure cannot be based only on mathematical arguments, but also on concrete experimentations of hypotheses of reconstruction of the sentences and restoration of the missing parts. The analysis of the problem text indicates that the sides of a rectangle are calculated with the aim of showing a case of the “Pythagorean theorem”. An alternative hypothesis, advanced at the beginning of last century, is unsupported and unsuitable.