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.(1 point)
To find the area of a circle, you can use the formula A = πr², where r is the radius of the circle.
Given that the diameter is 21 miles, you first need to find the radius by dividing the diameter by 2:
r = 21 mi / 2 = 10.5 mi
Now, substitute the radius into the formula:
A = 3.14 * (10.5)²
A = 3.14 * 110.25
A = 346.185
Therefore, the area of the circle, rounded to the nearest hundredths place, is 346.19 square miles.