Pi over 12 on a radian unit circle is a little more than a quarter of the circle. Radian units are an alternative to degrees.
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The circumference of a circle with a diameter of 12 cm is: about 37.7 cm
A circle with a 12 inch diameter has a 6 inch radius.
The circumference of a circle that has a radius of 12 feet is about 75.4 feet.
The area of a circle that has a 12-inch diameter is: 113.1 square inches.
A circle with a diameter of 12 inches has an area of ~113.1 square inches.