Cylindrical Shells: REVAMPED!

STUDENTS:
Take a few minutes to interact with this applet below. [br]After doing so, please answer the key question that appears below the applet. [br][br][b]Note:[/b][br]You can move the [b]LARGE POINTS [/b]at any time. [br][br][b][color=#1e84cc]To explore this resource in Augmented Reality, see the directions below the first screencast. [/color][/b]
KEY QUESTION:
How can we find the volume of this (or ANY) unraveled cylindrical shell? Explain.
TO EXPLORE IN AUGMENTED REALITY:
1) Open up GeoGebra 3D app on your device. [br][br]2) In the menu, go to OPEN. [br] In the search field, type [b]huehrzt4[br][br][/b]3) In the algebra view that appears below, be sure to slide slider [math]\alpha[/math] first. [br] Then slide slider [b]w. [br] [/b]After drag slider [b]s[/b] to unravel. [br][br][b]Note: [/b][br]The [b][color=#ff00ff]pink slider[/color][/b][color=#ff00ff][b] n[/b] [/color]controls the size of [color=#ff00ff][b]deltax.[br][/b][/color]To change the filling of the solid at any time, adjust the slider named [b]Filling[/b] (at the very bottom).
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Information: Cylindrical Shells: REVAMPED!