Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.
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When you double the diameter, the circumference is also doubled.
If you double the circumference. the diameter like wise would double.
circumference= pi(3.14) by the diameter. if your given the radius, double the radius and times by pi.
The circumference = pi x r2, and the diameter = 2r. So if you start with the circumference, you divide that number by pi (3.1416), then take the square root. What's left is the value of the circle's radius; double it to get the diameter.
The equation for a circle is PiD. The diameter is double the radius, so it is 7 yards in this case. The circumference is 7*PI. Which is approximately 21.98.