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A diameter is measured by using a ruler. However, you also could use a digital caliper to measure the diameter of a circle.
When you double the diameter, the circumference is also doubled.
12 inch diameter(also 6 inch radius).
Yes, it is.
The diameter would be 8cm, because the diameter is always double the radius. That's why the formula 2'Pi'r is also known as 'Pi'd.