A cone
cone
A cylinder. Also, howsabout a hemisphere ?
A cylinder has two parallel congruent faces and a curved surface.
Cylinder
sphere
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.)
A cylinder or half a torus (donut), or a long tubular shape whose ends are lined up so as to be parallel..
cone
A cube
triangular prism
One curved surface (that goes round the cylinder) and 2 flat ends