Assuming we are talking about a circle...
C = 2xpixr
23 = 2 x pi x r
r = 23/(2xpi)
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Circumference equals 2 X pi X radius, so work backwards. 18pi=2 X pi X radius divide pi. 18= 2 X radius divide by 2. radius= 9.
3.7 inches, approx.
A sphere of radius 12 inches cannot have a height of 23 inches. It is, in that case, a flattened sphere and a lot more detailed information about the flattening is required to find its volume.
If the diameter is 6 inches, then the radius is 3 inches.
Radius is merely..., diameter/2 3 inches/2 = 1.5 inches in radius ==============