use the correct formula to find the area of a circle if the diameter is 21mi round to the nearest hundreths place
The formula to find the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is given, we can find the radius by dividing the diameter by 2.
Given that the diameter is 21 miles, the radius is 21/2 = 10.5 miles.
Now, substitute the radius into the formula to find the area:
A = π(10.5)^2
A ≈ π(110.25)
A ≈ 345.58
Therefore, the area of the circle is approximately 345.58 square miles.