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.
The correct formula to find the area of a circle is:
A = π * (r^2)
Given that the diameter is 21 miles, the radius (r) is half of the diameter, so:
r = 21 mi / 2 = 10.5 mi
Now, substitute the value of the radius into the formula:
A = 3.14 * (10.5^2)
A = 3.14 * 110.25
A = 346.185
Rounded to the nearest hundredths place, the area of the circle is approximately 346.19 square miles.