Please note that "A translation is an isometry that maps all points of a figure the same distance in the same direction". Thus, a translation will never change the dimensions of any geometric figure. It will just shift the figure from one place to the other keeping it's dimensions the same.
Therefore, even when a regular pentagon with side lengths of 9 units is translated 2 units to the left, the length of one side of the pentagon after translation will still be 9 units.
