how to create a custom rectangle with specified width and lenght to use in model builder? any suggestions? ![]()
If you just need the extent of the polygon and not the actually polygon itself, then you can set the analysis extent to the desired shape. If you actually need a rectangle, you can create a featureclass/shapefile with a python script. What approach do you need?
I need to create a rectangle over an exsisting polygon. This rectangle must be 4 times bigger than existing polygon.

You can do the math and create a featureclass in the normal way specifying the points that produce the proportional area you need. There a number of point combinations that one could create and the will be affected by the desired width and/or height you choose. You will be constrained in both directions by the diameter of the circle, but you can scale the height and width to a accommodate your desired area
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