A diameter is not a unit of length and so no sensible answer is possible.
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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.
It is: pi*32*5 = 35*pi cubic cm
Twice as big.
It depends on what the 6 cm refer to! The diameter of a shape with a 6 cm diameter is ... surprise!... 6 cm.