These things are possible to do, only differenly.
For example, bring up the Coordinates Box. Hover your cursor above the lower left corner of the rectangle and press ALT+SHIFT to move the User Origin to the lower left corner of the rectangle. Then hover your cursor to the Upper right corner and the Coordinate Box will show the width and height of the rectangle.
Or, start using the Measure Tool. First click the lower left corner of the Rectangle to Measure from, then hover your cursor above the upper left corner of the rectangle and the Measure Tool will show you the height of the rectangle; hover your cursor above the lower right corner of the rectangle and the Measure Tool will show you the width of the rectangle.
With the Tracker input it is very easy to click any of the edges of the rectangle, choose the Offest Edge command of the Pet Palette and offset it to the desired value.
So my point is: these things can be done easily in ArchiCAD. It is just a different program and has different ways of achieving the same things.
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