The term diameter, relative to a circle, is the width. For a sphere, such as a planet, the distance from the surface to the center is actually the radius, which is one-half of the diameter.
For a cylinder, it depends on the orientation. If you have a can and it is right-side up, then the diameter is not the depth -- it's just the distance from one side of the top "circle" to the other, passing through the center. If you put the can on its side, then the diameter could become the "depth." But this terminology is normally not used for curved geometric solids.
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As you did not specify a depth, I can not provide an answer.
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If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
The radius is one half of the diameter. If the diameter is 20, the diameter is 10.
Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.