Find the area of the following circle.
r = 9 yd.
a = How many square yards?
To find the area of a circle, you can use the formula A = πr^2, where A represents the area and r is the radius of the circle. Given that the radius of the circle is 9 yards (r = 9 yd), we can substitute this value into the formula.
A = π(9^2) = π(81)
Now, to find the area in square yards, we need to use the conversion factor that 1 square yard is equal to 1 yard^2.
Thus, the area of the circle is 81π square yards.