Propably because it would be very difficult to measure the difference between the rings' diameters.
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pie times the radius squared should help you
A circle with a radius of 8 inches has a circumference of 50.27 inches.
To find the radius of a circle when given the circumference, you should start with the formula for circumference, which is this: circumference = 2*pi*radius To solve for the radius, you would the have to divide the circumference by 2*pi leaving you with a formula like this: radius = circumference/(2*pi) pi≈3.14159
Volume of a cylinder = pi*radius2*heightTo find the radius make the radius the subject of the above formula:radius = the square root of (Volume/pi*height)radius = square root (462/pi*12)radius = 3.500704303 unitsTo check that your answer is correct substitute the value of the radius into the original formula and it should work out as 462.
or where is the area, and is the radius. (Pi) = 3.14159 should be close enought for most calculations. A=Pi * r * r where is the area, and is the radius. (Pi) = 3.14159 should be close enought for most calculations.