You only told us the length of 3 sides, and from those 3, we can already see that it's not a rectangle. (If you take any 3 sides of a rectangle, two of them must be the same length.)
So we have no way to tell the length of the 4th side, or to add up the lengths of all 4 sides to get the perimeter. It could be many different things.
The only thing we know for sure is that the perimeter must be more than 2.55 meters. (That's the sum of the 3 sides you gave us.)
Rotating it by 180 degrees makes the shape turned in the opposite direction as the normal one, and dilating it by 1/2 shrinks the shape from its original form.
