Use the correct formula to find the area of a circle if the diameter is 21 mi round to the nearest hundredths place use 3.14
To find the area of a circle, you can use the formula A = πr^2, where r is the radius of the circle.
Since the diameter is given as 21 miles, the radius (r) would be half of the diameter, which is 21/2 = 10.5 miles.
Now, substitute the value of the radius into the formula:
A = π(10.5)^2
A = 3.14(110.25)
A = 345.99 square miles
Therefore, the area of the circle with a diameter of 21 miles is approximately 345.99 square miles when rounded to the nearest hundredths.