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 .
To find the area of a circle, the formula is A = πr^2 where r is the radius of the circle.
Given that the diameter is 21 mi, we first need to find the radius. The radius is half the diameter, so the radius (r) is 21 mi / 2 = 10.5 mi.
Now, we can plug the radius into the formula:
A = 3.14 * (10.5)^2
A = 3.14 * 110.25
A = 346.185
Rounding to the nearest hundredths place, the area of the circle is approximately 346.19 square miles.