To find the circumference of a circle when you know the diameter, you can use the formula:
\[ \text{Circumference} = \pi \times \text{Diameter} \]
Given that the diameter (d) of the circle is 8 yards, you can plug this value into the formula:
\[ \text{Circumference} = \pi \times 8 \text{ yards} \]
Using the approximate value of \(\pi \approx 3.14\):
\[ \text{Circumference} \approx 3.14 \times 8 \approx 25.12 \text{ yards} \]
So, the circumference of the circle is approximately 25.12 yards.