A nominal rectangular panel has width 330 mm and height 440 mm. A measured corner is displaced horizontally by 3 mm from its target x coordinate. For a true rectangle, diagonal squared equals width squared plus height squared. The measured diagonals are d1=550 mm and d2=554 mm. A drawing permits at most 2 mm difference between diagonals; this supplied rule alone does not prove all geometry correct.
Calculate the nominal diagonal in mm. Keep intermediate values unrounded; round the final result to four decimal places if necessary.
