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 pi.
a. 65.94 mi^2
b. 131.88 mi^2
c. 1,384.74 mi ^2
d. 346.19 mi^2
To find the area of a circle, you can use the formula A = πr^2, where r is the radius of the circle.
Given that the diameter is 21 mi, the radius would be half of that, which is 10.5 mi.
Now plug the radius into the formula:
A = 3.14 * (10.5)^2
A = 3.14 * 110.25
A = 346.185
Rounded to the nearest hundredth, the area of the circle is:
A = 346.19 mi^2
Therefore, the correct answer is d) 346.19 mi^2.