# How to get the dimensions of a rectangle?

Suppose I create a Rectangle of dimensions 1 and 3. Is there any function in Mathematica that I can use to recover the dimensions of the original rectangle? If there is no such a function, is there a way of recovering the dimensions?

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I assume you mean from a Graphics object. If so, something like:
Cases[g, Rectangle[x___] :> {x}, 2]

where g is the graphics object will return a list of coordinates from which dimensions can be derived.
Worth to add Normal on g in case of GraphicsComplex. – Kuba Mar 19 '14 at 6:00