Rectangle Properties Question

Hi

I am a new user. I have drawn a basic rectangle using the rectangle tool. I need to re-check the dimensions of that rectangle and possibly change the length and width of the sides. How do I access and edit those specifications for a rectangle?

Comparing this situation to a Line, when you select a drawn line, in the Line properties window, under the Geometry Heading, the X and Y values are shown and you can edit those values to change the line length. That is what I want to do, but with a rectangle. However, when I select the rectangle, in the properties widow, under the Geometry Heading, it does not display the lengths of the sides, but instead lists values of 0.0, and the area of the rectangle.

Thanks for your help.