Answer:
A cylinder
Step-by-step explanation:
Picture a can of lets say beans.
It has two circles on its top and bottom side, as well as a cylinder connecting those two parts.
If you were to disassemble the can, you would be left with two circles and a cylinder.
Now the how dose a rectangle connect to a can? Well, if you were to flatten the cylinder you are left with a rectangle and two circles.
Pertaining to the problem, if you were to take a 2d rectangle on a coordinate plane and spin it around the y-axis you would create, in the 3d perspective, a cylinder.
Additionally if you were looking at it from a 2d perspective a circle.
