I think that it should be 3.14 inches across because you take pi and multiply it by the diameter.
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The circumference of a circle if the diameter is 1 equals 3.1412 (π).
The circumference of a circle with a diameter of 1 is Pi: 3.1416
circumference = 2 * pi * r ----> pi is a constant in this case circumference = 2 * 3.142 * 10 ------> radius is 1/2 of a diameter So, circumference of this circle is 62.84 inches
If a circle has a circumference of 3.14 (pi) the diameter is: 1
I would think it would double also. Say Circle A has a diameter of 1 inch and Circle B has a diameter of 2 inches. To get the circumference, you multiply the diameter by pi (3.14). So 1 x 3.14 = 3.14 so that is the circumference of Circle A. To get the circumference of Circle B you need to multiply 2 x 3.14 = 6.28. And 6.28 is twice 3.14 so I would think the circumference doubles.