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 .
1,384.74 mi squared
65.94 mi squared
131.88 mi squared
346.19 mi squared
The correct formula to find the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is 21 mi, the radius would be half of that, which is 10.5 mi.
Now, plug in the values 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 346.19 mi squared.
Therefore, the correct answer is 346.19 mi squared.