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If the ring is 2 cm in diameter, the US ring size is 10 and a quarter. In terms of British and Australian size, it is said to be U.
The diameter is 25/pi cm = 7.96 cm
size 8
The volume of a sphere with a diameter of 25cm is about 8181.2cm3
Its area is: pi*52 = 25*pi or 78.539 cm to three decimal places