circumference = Pi * diameter
diameter = circumference / Pi
The diameter is 4/Pi or approximately1.2732490258705930933383273555459.
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The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference).
Circumference is simply pi times the diameter. The approximate value of pi is 3.14, so for a circle 4 feet in diameter, the circumference is 4 x 3.14 = 12.56 feet, approximately.
A circle with a radius of 4 inches has a circumference of 25.13 inches.
The circumference of 1.5 diameter is: 4.712
Circumference = Pi * diameter