A cylinder
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.)
The 3D shape made of two circles and rectangles is a cylinder. It consists of two circular bases connected by a curved rectangular surface, which wraps around the sides. This shape is commonly found in everyday objects, such as cans and pipes. The circles represent the top and bottom faces, while the rectangles form the lateral surface.
A cylinder or half a torus (donut), or a long tubular shape whose ends are lined up so as to be parallel..
A cube
cone
triangular prism