The diameter of a circle measures $12 \mathrm{yd}$. What is the circumference of the circle? Use 3.14 for $\pi$, and do not round your answer. Be sure to include the correct unit in your answer.

Step 1 ：Given that the diameter of the circle is 12 yards, we can use the formula for the circumference of a circle, which is \(C = \pi d\). Here, \(\pi\) is a constant approximately equal to 3.14, and \(d\) is the diameter of the circle.

Step 2 ：Substitute the given values into the formula: \(C = 3.14 * 12\).

Step 3 ：Calculate the result to find the circumference: \(C = 37.68\) yards.

Step 4 ：Final Answer: The circumference of the circle is \(\boxed{37.68 \text{ yd}}\).