Cone
A cylinder. Also, howsabout a hemisphere ?
cone
triangle * * * * * A triangle is NOT a 3d shape! A cube.
its a lens...1 curved edge = a circle, 1 flat surface = back, 1 curved surface = front. (these are used in some battery-less flashlights, as an example.)
cone
A cone
A cone.
Cone
A cylinder
cone
A cylinder. Also, howsabout a hemisphere ?
cone
A cone, like an ice cream cone.
is it a vertex
The question is not particularly clear but I suspect that the answer is a vertex.
sphere