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 for π .
Given that the diameter is 21 mi, we can first find the radius by dividing the diameter by 2.
Radius = Diameter / 2 = 21 mi / 2 = 10.5 mi
Now, we can use the formula to find the area of the circle:
Area = π * radius^2
Area = 3.14 * (10.5)^2
Area = 3.14 * 110.25
Area ≈ 346.185 (rounded to the nearest hundredths)
Therefore, the area of the circle with a diameter of 21 miles is approximately 346.19 square miles.