A diameter of 3.5 cm is equivalent to approximately 1.38 inches. This size is similar to the diameter of a standard bottle cap or a small coin, making it relatively compact. To visualize it, it would be about the width of a large marble.
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The diameter of a circle is the distance across it, passing through the center. If you have a diameter of 35 cm, that means the length from one edge of the circle to the opposite edge, through the center, measures 35 cm.
It is a diameter of 39.37 cm.
A diameter is not a unit of length and so no sensible answer is possible.
It is: pi*32*5 = 35*pi cubic cm
Twice as big.