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None. The only shape with a diameter is the circle.
A circle is the set of all the points that have the same distance from a given point (its center). If you rotate a shape, you rotate it in such a way that you keep any point a fixed distance from the center of rotation.
When a circle is folded along its diameter, it creates two congruent halves or semicircles.
A shape can usually be rotated through a full circle of 360 degrees.
It depends what you know. The top of a cylinder is in the shape of a circle. So, to find the diameter of the cylinder (which is also the diameter of the circle), if you know the radius, just multiply it by two.