Modeling a Play Tent in GeoGebra Augmented Reality

This play tent was modeled using [b][color=#1e84cc]a cone[/color][/b] (obviously) and [b][color=#ff00ff]what other surface[/color][/b]? [br][br]Note:[color=#ff00ff] [br][b]The pink surface is NOT a cylinder![/b] [/color]How can we tell? If it's not a cylinder, what is it?
Quick Demo
– Tim Brzezinski

Information: Modeling a Play Tent in GeoGebra Augmented Reality