1) Open up GeoGebra 3D app on your device. [br][br]2) Go to the MENU (horizontal bars) in the upper left corner. Select OPEN. [br] In the Search GeoGebra Resources input box, type [b]h2fkfsfm[/b][br] (Note this is the resource ID = last 8 digits of the URL for this resource.)[br][br]How do the values of[b] R [/b]and [b]r[/b] affect the graph of this [b][color=#1e84cc]surface[/color][/b]? [br][br][b]What happens when R = 0? [br][br]What happens when R = r? [br][br]What happens when R > r? [br][br]What happens when R < r ? [/b]