How to get Rect from scene Button ?

Hi,

I need to get the Rect of a scene Button, i explain. I've a button on my scene, i give it to my script:

 public Button myButton;
 
 void Start(){
     Rect myButtonRect = myButton.getRect; ????  
 }

It's mean that i need the x, y, width and height value of my Button which is already in my scene.

Hope you understand my question :)

Thank you for any answer.