The shape that can slide and roll, stack and roll, and has no vertices is a cylinder. Cylinders have curved surfaces that allow them to roll smoothly, and they can stack on top of each other without any sharp edges. Their continuous surface and circular bases provide stability when stacked.
Yes. A cone will roll following a circular path with the central axis being the point of intersection of the sides of the cone (which is the point of a pointed cone).
both
I think both
yes it has a flat bottom surface and one vertice
The square based pyramid does not stack or roll.
A pyramid will not roll and you cannot stack objects on top.
cone
yes it can
no
The shape that can slide and roll, stack and roll, and has no vertices is a cylinder. Cylinders have curved surfaces that allow them to roll smoothly, and they can stack on top of each other without any sharp edges. Their continuous surface and circular bases provide stability when stacked.
Yes. A cone will roll following a circular path with the central axis being the point of intersection of the sides of the cone (which is the point of a pointed cone).
both
A cylinder
No
yes
you are a cone