12.5663706144, because the diameter (4) times Pi equals circumference
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The circumference of a 4 inch round circle is: about 12.57 inches. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).
Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).
The circumference of a circle is the diameter times pi (3.141) so therefore a 4 meter circumference circle has a diameter of 1.273 m E.g. 4 / 3.141 = 1.273
You need to multiply the diameter by C = Pi x diameterFor your particular query, of a 4-inch diameter circle, it is approximately 12.56 (using pi as 3.14) for the circumference, or distance around the circle. Using a more precise value for pi, it is closer to 12.57 (12.566).
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).