7 is a number, not a shape in 2 or more dimensions. A number does not have a diameter.
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7/pi = diameter
Diameter = 7/pi = 2.228169203 inches
The formula relating circumference and diameter is C = d*pi, so the diameter is 7/pi.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203
The volume of a sphere with a diameter of 7 meters is about 179.6m3