What is the area of a circle whose diameter is 8 yd?

To find the area of a circle, you use the formula A = πr^2, where A is the area and r is the radius of the circle. Since the diameter is 8 yards, the radius is half of that, which is 4 yards. Plugging this into the formula, we get A = π(4)^2 = 16π square yards. So, the area of the circle is 16π square yards.