No. they are in fact very different. A circle's diameter is the length of the longest line that goes all the way across it. A three-dimensional shape has a volume, which is the amount three-dimensional space enclosed by it.
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A sphere with a diameter of 6cm has a volume of 113.1 cm3
The volume of a cylinder if the diameter is 15mm and the height is 4.8 mm is 848.23 cubic mm
The height of a cylinder with the diameter of 34 inches and a volume of 350 gallons is: 89.05 inches.
38.465
The formula for the volume of a sphere is 4/3 x pi x r3. This means the volume of a sphere with diameter (which is twice as long as the radius) is 33.51 cm3.