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The circumference also doubles.
No. The formula for circumference of a circle is pi x diameter. As pi is 3.14... then the circumference will be at least 3.14 times the diameter.
That's 41/2% less than the circumference of the circle.
If you're talking about a circle, then the perimeter is more often called the "circumference".If you know the circumference, then Diameter = (circumference) divided by (pi).(Pi) is approximately 3.14159 26535 89792 . But if you use (22/7), you're off by less than 1/10th of 1 percent.
Use the following formula to figure diameter when the circumference of a circle is known: Circumference = Pi x Diameter 20 = 3.1415927 x D D = 6.366