Circumference = 2 x pi x radius. If you want an estimate, you can round some of the numbers involved - either the radius, or pi, or both.
Diameter of a circle = circumference/pi
I'm not sure what you mean. If the radius is 5, the circumference is 10pi. (about 31 and a half) If the circumference is 5, the radius is 5 divided by 2pi. (about four fifths)
If a circle has a diameter of 14, the circumference is: 43.98.
The circumference of 5 foot circle is: 15.7
The estimate of a circle with a circumference of 288 is a circle with a diameter of 91.67
The best estimate for the circumference of a circle that has a diameter of 6 is 18.9
The circumference is 50.3 inches.
The circumference, C, of a circle is given by the formula
Circumference=20.1 cm.
A circle with a radius of 12 inches has a circumference of 75.4 inches.
The circumference of a circle that has a diameter of 6.75 feet is about 21.2 feet.
Seven inches.
37.69911184307752
C = 113
To estimate the circumference, multiply the diameter by 3. If you have a calculator or are decent at multiplication and have the time, multiply it by 3.14. If you can, multiply it by pi.
About 30 inches