The diameter of a human hair can vary, but on average, it is about 0.002 to 0.006 inches in diameter. This measurement can be influenced by factors such as genetics, hair type, and overall health. The diameter of human hair is typically measured using micrometers or specialized imaging techniques.
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Twelve inches is a length. It can be a diameter, but if it is a diameter, you would simply say 'The circle is 12 inches diameter'. So; how big is it - it is 12 inches.
The diameter of the circle will be: 26.1 inches.
If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
If a circle has a diameter of 12.8 inches its circumference is: 40.21 inches (circumference = diameter x Pi).
The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).