To calculate the approximate circumference of a circle, you can use the formula: Circumference = pi * diameter. Given that the diameter is 12 inches and approximating pi as 3.14, we can substitute these values into the formula:
Circumference = 3.14 * 12
Circumference β 37.68 inches
Therefore, the approximate circumference of a circle with a diameter of 12 inches is 37.68 inches.