Since the circumference is Pi times the diameter then divide the circumference by Pi (3.14159) to get the diameter
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Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.
Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.
The equation for circumference is C=(Pi)*d or 3.14 times the diameter. Therefore, you answer would be 6.625*3.14=20.8025 inches.
A wheel is in the shape of a circle. The formula for the circumference of a circle is 2πr where r is the radius. But, the diameter of a circle is twice the radius so this equation can be written, Circumference = πd where d is the diameter. The Circumference is therefore π times as big as the diameter, π = 3.142 or 22/7 approx.
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)