The circumference is equal to r2*pie or 38.5 inches
Another answer:
Circumference of a circle = 2*pi*radius or pi*diameter
Circumference = 7*pi = 21.99114858 or 22.0 inches to one decimal place.
The diameter of a circle whose circumference is 6 inches = 1.91 inches (rounded to 2 decimal places).
Circumference of circle: 31*pi = 97.389 inches rounded to 3 decimal places
Circumference of circle: 17.4*pi = 54.664 inches rounded to 3 decimal places
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x pi = circumference).
If a circle is 19 inches in circumference the diameter is: 6.048 inches (circumference divided by Pi = diameter).
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).
If a circle has a diameter of 24 inches its circumference is: 75.4 inches (diameter x Pi = circumference).
If the circumference of a circle is 10 inches, the diameter is: about 3.183 inches. (circumference divided by Pi = diameter)
If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
The diameter of a circle with circumference of 25.56 inches is: 8.136 inches (diameter x Pi = circumference).
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).