First, I have created both a plane and a curve object, then I adjusted their dimensions as desired. Noticing that the scales of both changed with the dimensions, I press CtrlA after the re-dimensioning of each of the objects, with that object being selected alone.
Till here, everything is fine, both objects have now the desired dimensions with a scale of one.
The issue is: When I add a curve modifier to the plane and choose the curve previously created in that modifier, the plane dimensions change for some reason! :s
Any idea why?!
Link to an example blend file:
Go to the modifier tab of the plane object and select the curve called Circle to see how the dimensions of the plane change!