The circumference of a circle with a diameter of 22 is 22 times pi or approximately 69.08.
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The circumference is about 22 units.
Diameter of a circle = circumference/pi
The circumference of a circle is given by π × diameter. π =3.14159265...... It is approximately 3.14 which, itself, is approximately 22/7. To estimate the circumference of a circle, multiply the diameter by 3 and add the diameter divided by 10 and that division divided by 2; this will give you 3.15 × diameter which is fairly close. Alternatively, multiply the diameter by 22 and divide by 7.
The diameter of a circle with the circumference of 3.25 is: 1.034
If the circumference of a circle is 17.27, the diameter is: 5.5